SSC CHSL Tier 1 2021 General Intelligence & Reasoning Questions with Solutions

Explanation

When a mirror is placed at XY to the right of the combination, the mirror image of H 2 J 4 K 6 is formed by reversing both the order of the characters and their individual lateral orientations.

The rightmost character 6 appears first on the left in the reflection and is laterally inverted to resemble 9. The character K is laterally inverted to resemble Y. The character 4 is laterally inverted to resemble H. The character J is laterally inverted to resemble 2. The character 2 is laterally inverted to resemble C. The leftmost character H is horizontally symmetrical, so its reflection remains H.

Combining these laterally inverted characters in reverse order yields the sequence 9 Y H 2 C H.

Explanation

When a vertical mirror is placed at the right side MN, the sequence of characters is reversed from right to left, and each character undergoes lateral inversion (left-to-right flip). The rightmost character b is closest to the mirror, so its mirror image, which is d, must appear first in the combination. Since only option B begins with the letter d, it represents the correct mirror image of the given combination.

Explanation

The pattern followed in the series is: First term = 12 Second term = 12 × 3 - 4 = 32 Third term = 32 × 4 - 5 = 123 Fourth term = 123 × 5 - 6 = 609 Fifth term = 609 × 6 - 7 = 3647

Explanation

Substituting the sequential mathematical signs into the given equation:

25 ÷ 5 - 10 + 2 × 4 = 3

Applying the BODMAS rule:

First, perform the division: 25 ÷ 5 = 5

Next, perform the multiplication: 2 × 4 = 8

Now, substitute these values back into the expression: 5 - 10 + 8

Perform addition and subtraction from left to right: 5 - 10 + 8 = -5 + 8 = 3

The left-hand side equals the right-hand side, balancing the equation.

Explanation

The general pattern followed by the number pairs is that the second number is equal to the cube of the first number plus the square of the first number, which can be represented as x³ + x², or x² × (x + 1), where x is the first number.

Applying this mathematical operation to the first number 15: 15² × (15 + 1) = 225 × 16 = 3600

Since the second number in this pair is 3150 instead of 3600, it does not follow the pattern.

Explanation

According to the given statements, all apples are bananas and all bananas are nuts. By the transitive property of set containment, since the set of apples is a subset of bananas, and bananas is a subset of nuts, the set of apples is also a subset of nuts. This makes Conclusion I logically correct.

Similarly, all grapes are bananas and all bananas are nuts. Applying the same transitive relation, because the set of grapes is entirely contained within the set of bananas, which is entirely contained within the set of nuts, the set of grapes must be a subset of nuts. This makes Conclusion II logically correct.

Explanation

The series is formed by incrementing the position of each corresponding letter in consecutive terms by a progressive constant value.

For the first letter, the position increases by +1 in each step: X (+1) → Y (+1) → Z (+1) → A (+1) → B.

For the second letter, the position increases by +2 in each step: Y (+2) → A (+2) → C (+2) → E (+2) → G.

For the third letter, the position increases by +3 in each step: Z (+3) → C (+3) → F (+3) → I (+3) → L.

For the fourth letter, the position increases by +4 in each step: A (+4) → E (+4) → I (+4) → M (+4) → Q.

Applying these rules to find the third term, we get Z, C, F, and I, which forms the cluster ZCFI.

Explanation

The coding scheme follows a pattern where each letter of the word is shifted to its immediate next letter in the English alphabetical order, which is a shift of + 1.

Applying this rule to the word SCHOOL: S + 1 = T C + 1 = D H + 1 = I O + 1 = P O + 1 = P L + 1 = M This yields TDIPPM.

Applying the same systematic shift of + 1 to each letter of the word UNIVERSITY: U + 1 = V N + 1 = O I + 1 = J V + 1 = W E + 1 = F R + 1 = S S + 1 = T I + 1 = J T + 1 = U Y + 1 = Z

This results in the coded form VOJWFSTJUZ.

Explanation

Ramesh has only two children, Rajat and Nilesh, which makes Rajat and Nilesh siblings. Since Kapil is Rajat's nephew, Kapil must be the son of Rajat's sibling. As Nilesh is Rajat's only sibling, Kapil is the son of Nilesh, which means Nilesh is the father of Kapil.

Explanation

The time duration between 26 January 2019 and 26 January 2022 is exactly 3 years. Within this period, 2020 is a leap year containing 366 days, whereas 2019 and 2021 are ordinary years containing 365 days each.

An ordinary year of 365 days contributes 1 odd day (365 ÷ 7 leaves a remainder of 1), and a leap year of 366 days contributes 2 odd days (366 ÷ 7 leaves a remainder of 2).

The total number of odd days from 26 January 2019 to 26 January 2022 is 1 + 2 + 1 = 4 odd days.

Adding 4 days to Saturday gives Wednesday, meaning 26 January 2022 was a Wednesday.

To find the day on 30 January 2022, we add the remaining days in January: 30 - 26 = 4 days.

Adding 4 days to Wednesday results in Sunday.

Explanation

The pattern is based on splitting the eight-letter word into two equal halves of four letters each, and then swapping their positions so that the second half comes before the first half.

For ACCURATE, the first half is ACCU and the second half is RATE, which combines to form RATEACCU.

For ANALYSIS, the first half is ANAL and the second half is YSIS, which combines to form YSISANAL.

Applying this same rule to CAPACITY, the first half is CAPA and the second half is CITY. Swapping their positions gives CITYCAPA.

Explanation

The coding scheme follows a pattern where the first three letters of the word are shifted forward by increasing values of +1, +2, and +3, while the last three letters are shifted backward by values of -1, -2, and -3.

For the word ABROAD: A + 1 = B B + 2 = D R + 3 = U O - 1 = N A - 2 = Y D - 3 = A This results in BDUNYA.

For the word BECAME: B + 1 = C E + 2 = G C + 3 = F A - 1 = Z M - 2 = K E - 3 = B This results in CGFZKB.

Applying this same logic to CANCER: C + 1 = D A + 2 = C N + 3 = Q C - 1 = B E - 2 = C R - 3 = O

This sequence yields the coded letters DCQBCO, which corresponds to option D.

Explanation

The given series follows an alternating pattern of multiplication and subtraction with consecutively increasing integers:

13 × 2 = 26 26 - 3 = 23 23 × 4 = 92 92 - 5 = 87 87 × 6 = 522

Applying this pattern, the missing number in the series is 23 × 4 = 92.

Explanation

The series is formed by repeating the 7-letter pattern "t s r a s r t" three times:

t s r a s r t | t s r a s r t | t s r a s r t

By dividing the series into three equal groups of 7 letters, we can fill in the blanks systematically:

First group: t [s] r a s [r] t Second group: [t] s [r] a [s] [r] t Third group: [t] s [r] [a] s r t

Collecting the letters in the blanks from left to right gives: s, r, t, r, s, r, t, s, a.

Explanation

By deciphering the mathematical operators represented by the letters: P denotes × Q denotes ÷ R denotes + S denotes -

Substituting these operations into the given expression: 130 - 61 + (23 × 4) - 83 + (62 ÷ 2)

Using the BODMAS rule, solve the parentheses first: 23 × 4 = 92 62 ÷ 2 = 31

Now substitute these values back into the expression: 130 - 61 + 92 - 83 + 31

Perform addition and subtraction: 69 + 92 - 83 + 31 = 161 - 83 + 31 = 78 + 31 = 109

Explanation

The mathematical relation between the first number x and the second number y in the standard pairs is y = (√x - 2)². Applying this formula to the first number in the pair 100:81, we obtain (√100 - 2)² = (10 - 2)² = 8² = 64. Since the second number in this pair is 81 instead of 64, this pair does not conform to the pattern followed by the other pairs.

Explanation

The correct mathematical equation is: (40 × 6) ÷ 8 + 14 - (7 × 16) + (13 × 12) = 26

By interchanging the numbers 8 and 12, the equation becomes: (40 × 6) ÷ 12 + 14 - (7 × 16) + (13 × 8) = 26

Applying the BODMAS rule to solve the left-hand side:

First, solve the operations inside the brackets: 40 × 6 = 240 7 × 16 = 112 13 × 8 = 104

Substitute these values back into the equation: 240 ÷ 12 + 14 - 112 + 104

Next, perform the division: 240 ÷ 12 = 20

Now, perform the addition and subtraction: 20 + 14 - 112 + 104 = 34 - 112 + 104 = 26

Since the left-hand side is equal to the right-hand side, interchanging 8 and 12 satisfies the equation.

Explanation

The given series follows the pattern of the product of consecutive integers, represented by the formula Tₙ = n(n + 1) starting from n = 2:

For n = 2: 2 × 3 = 6 For n = 3: 3 × 4 = 12 For n = 4: 4 × 5 = 20 For n = 5: 5 × 6 = 30 For n = 6: 6 × 7 = 42 For n = 7: 7 × 8 = 56

Alternatively, the difference between consecutive terms increases by 2 each time: 12 - 6 = 6 20 - 12 = 8 30 - 20 = 10

Following this pattern, the next difference must be 12, which gives: 30 + 12 = 42

To verify, the subsequent difference is 14, which gives: 42 + 14 = 56

Explanation

The coding pattern multiplies the standard numerical position of consonants by 2 while leaving the numerical position of vowels unchanged.

Applying this to the word CHECK: C is a consonant, position 3: 3 × 2 = 6 H is a consonant, position 8: 8 × 2 = 16 E is a vowel, position 5: 5 C is a consonant, position 3: 3 × 2 = 6 K is a consonant, position 11: 11 × 2 = 22 This gives the code 6165622.

Applying this to the word SURGE: S is a consonant, position 19: 19 × 2 = 38 U is a vowel, position 21: 21 R is a consonant, position 18: 18 × 2 = 36 G is a consonant, position 7: 7 × 2 = 14 E is a vowel, position 5: 5 This gives the code 382136145.

Applying the same logic to PRIEST: P is a consonant, position 16: 16 × 2 = 32 R is a consonant, position 18: 18 × 2 = 36 I is a vowel, position 9: 9 E is a vowel, position 5: 5 S is a consonant, position 19: 19 × 2 = 38 T is a consonant, position 20: 20 × 2 = 40

Combining these numbers yields 3236953840.

Explanation

In all the pairs except D, the second number is obtained by multiplying the first number by 17. For option D, 15 multiplied by 17 is 255, whereas the given number is 256.

Explanation

The given series follows an alternating pattern of mathematical operations:

19 × 2 - 1 = 37 37 × 2 = 74 74 × 2 - 1 = 147 147 × 2 = 294

Following this logic, the next term is obtained by multiplying the previous term by 2 and subtracting 1:

294 × 2 - 1 = 588 - 1 = 587

Explanation

The series follows a specific mathematical pattern for each corresponding letter in the clusters:

First letters decrease by 4: T (20) → P (16) → L (12) → H (8) → D (4)

Second letters increase by 6: V (22) → B (2) → H (8) → N (14) → T (20, swapped with Y in the final cluster)

Third letters decrease by 8: E (5) → W (23) → O (15) → G (7) → Y (25, swapped with T in the final cluster)

Fourth letters increase by 10: Q (17) → A (1) → K (11) → U (21) → E (5)

Applying these rules, the missing cluster in the third position is LHOK.

Explanation

The relationship between the terms is based on reversing the order of the letters in each word.

Reversing the letters of the first term Tis gives Sit. Reversing the letters of the third term Tip gives Pit. Following the same pattern, reversing the letters of the fifth term Ten gives Net.

Explanation

The relationship between the numbers in each pair follows the pattern where the second term is obtained by multiplying the first term by 14.

For the first pair: 9 × 14 = 126

For the third pair: 21 × 14 = 294

Applying this same mathematical relation to the middle pair: Third term × 14 = 238 Third term = 238 ÷ 14 = 17

Explanation

To arrange the words in alphabetical order as they appear in a dictionary, we compare them letter by letter from left to right.

All five words begin with the letter A.

Comparing the second letters, Abbreviation, Abduct, Absolutely, and Absorption have b, while Accurate has c. Since b comes before c, Accurate (5) is the last word in the sequence.

Now, comparing the third letters of the remaining words, Abbreviation has b, Abduct has d, and Absolutely and Absorption both have s. Since b comes before d, and d comes before s, Abbreviation (4) is the first word, followed by Abduct (3).

Next, to compare Absolutely (2) and Absorption (1), we look at their sixth letters because their first five letters, A-b-s-o-l and A-b-s-o-r, differ at the fifth and sixth positions. Comparing l in Absolutely and r in Absorption, l comes before r. Thus, Absolutely (2) comes before Absorption (1).

Arranging all the words in this sequence gives the order 4, 3, 2, 1, 5.

Explanation

The given series consists of consecutive prime numbers starting from 229.

The prime numbers in this sequence are: 229, 233, 239, 241, 251

The next consecutive prime number after 251 is 257, as it has no divisors other than 1 and itself.

Explanation

The pattern followed in the given pairs is: The first two letters of the word are swapped. The middle two letters are replaced by their opposite letters in the English alphabet (where the sum of the alphabetical positions of opposite letters is 27). The last two letters of the word are swapped.

Applying this pattern to the word MINUTE: First two letters MI when swapped become IM. Middle two letters NU are replaced by their opposites: the opposite of N is M, and the opposite of U is F. Last two letters TE when swapped become ET.

Combining these three parts gives the code IMMFET.

Explanation

The pattern followed in each row is: (First number × 2) + (Second number × 3) - 2 = Third number

Applying this to the first row: (6 × 2) + (8 × 3) - 2 = 12 + 24 - 2 = 34

Applying this to the second row: (3 × 2) + (2 × 3) - 2 = 6 + 6 - 2 = 10

Applying this to the third row: (11 × 2) + (18 × 3) - 2 = 22 + 54 - 2 = 74

Explanation

To arrange the words in alphabetical order as they appear in an English dictionary, compare them letter by letter from left to right.

All five words begin with the prefix Dra. Comparing the fourth letter of each word: Draft has f. Dragon has g. Drain has i. Drake has k. Drape has p.

Arranging these fourth letters alphabetically gives the sequence f, g, i, k, p. This corresponds to the sequence of words Draft (1), Dragon (5), Drain (3), Drake (2), and Drape (4), which yields the order 1, 5, 3, 2, 4.

Explanation

Substitute the symbols from the correct option into the given expression: 14 × 5 + 55 - 74 = 12 × 4 + 3

Solve the left-hand side (LHS) of the equation using the BODMAS rule: LHS = 14 × 5 + 55 - 74 First, perform multiplication: 14 × 5 = 70 Next, perform addition and subtraction: 70 + 55 - 74 = 125 - 74 = 51

Solve the right-hand side (RHS) of the equation using the BODMAS rule: RHS = 12 × 4 + 3 First, perform multiplication: 12 × 4 = 48 Next, perform addition: 48 + 3 = 51

Since both sides equal 51, the equation is balanced.

Explanation

The coding pattern follows a specific letter-shifting rule where the first three letters of the word are shifted backward by 1, 2, and 3 positions respectively, and the last three letters are shifted forward by 1, 2, and 3 positions respectively.

Applying this pattern to the word EITHER:

E - 1 = D I - 2 = G T - 3 = Q H + 1 = I E + 2 = G R + 3 = U

Thus, EITHER is coded as DGQIGU.

Explanation

The given number series follows a pattern where each term is obtained by multiplying the previous term by a consecutive natural number and then adding that same natural number.

Let the terms of the series be T₁, T₂, T₃, T₄, T₅, T₆.

T₁ = 5

T₂ = 5 × 1 + 1 = 6

T₃ = 6 × 2 + 2 = 14

T₄ = 14 × 3 + 3 = 45

T₅ = 45 × 4 + 4 = 184

T₆ = 184 × 5 + 5 = 925

Following this rule, the missing term that replaces the question mark in the series is 14.

Explanation

According to the rules of immediate conversion of syllogisms, a statement of the form Some A are B can be logically converted into Some B are A. Applying this rule of conversion to the second statement Some bungalows are flats, we directly obtain the conclusion Some flats are bungalows. Thus, conclusion II logically follows.

To evaluate conclusion I, we notice that the middle term bungalows is not distributed in either statement, as both premises are particular affirmative propositions. When the middle term is not distributed in at least one premise, no valid conclusion can be drawn between the remaining terms, apartments and flats. Thus, conclusion I does not logically follow. Therefore, only conclusion II follows.

Explanation

The given series follows an alternating pattern of multiplication and addition, where the operations decrease by 1 in each subsequent step:

First term to second term: 6 × 6 = 36 Second term to third term: 36 + 5 = 41 Third term to fourth term: 41 × 4 = 164 Fourth term to fifth term: 164 + 3 = 167 Fifth term to sixth term: 167 × 2 = 334

Following this alternating sequence of × 6, + 5, × 4, + 3, × 2, the number that replaces the question mark is 41 × 4 = 164.

Explanation

The given series follows a double-difference pattern where the differences of consecutive terms increase by consecutive prime numbers.

First, find the differences between consecutive terms: 17 - 13 = 4 24 - 17 = 7 36 - 24 = 12 55 - 36 = 19 85 - 55 = 30 128 - 85 = 43 188 - 128 = 60

Next, find the differences between these differences (second-level differences): 7 - 4 = 3 12 - 7 = 5 19 - 12 = 7 30 - 19 = 11 43 - 30 = 13 60 - 43 = 17

The sequence of second-level differences (3, 5, 7, 11, 13, 17) consists of consecutive prime numbers starting from 3. The next prime number in this sequence is 19.

Adding this prime number to the last first-level difference yields the next difference: 60 + 19 = 79

Adding this difference to the last term of the series gives the next number: 188 + 79 = 267

Explanation

The series follows a pattern of decreasing positional values for each letter in successive clusters:

The first letters decrease by 1: K (11) → J (10) → I (9) → H (8) → G (7).

The second letters decrease by 2: G (7) → E (5) → C (3) → A (1) → Y (25).

The third letters decrease by 3: C (3) → Z (26) → W (23) → T (20) → Q (17).

The fourth letters decrease by 4: J (10) → F (6) → B (2) → X (24) → T (20).

Applying this pattern, the missing cluster in the series is ICWB.

Explanation

The code for each letter is determined by the formula 2n - 1, where n represents the alphabetical position of the letter (A = 1, B = 2, ..., Z = 26).

For the word DIVIDE: D (4) -> 2 × 4 - 1 = 7 I (9) -> 2 × 9 - 1 = 17 V (22) -> 2 × 22 - 1 = 43 I (9) -> 2 × 9 - 1 = 17 D (4) -> 2 × 4 - 1 = 7 E (5) -> 2 × 5 - 1 = 9 This gives the code 7 17 43 17 7 9.

Applying the same formula to the word ADDITION: A (1) -> 2 × 1 - 1 = 1 D (4) -> 2 × 4 - 1 = 7 D (4) -> 2 × 4 - 1 = 7 I (9) -> 2 × 9 - 1 = 17 T (20) -> 2 × 20 - 1 = 39 I (9) -> 2 × 9 - 1 = 17 O (15) -> 2 × 15 - 1 = 29 N (14) -> 2 × 14 - 1 = 27

The corresponding values are 1, 7, 7, 17, 39, 17, 29, 27. Combining the first two values (1 and 7) due to a spacing format omission yields the sequence 17 7 17 39 17 29 27.

Explanation

The pattern followed by the number-pairs is that the second number is obtained by subtracting 2 from the square root of the first number:

Second number = √(First number) - 2

Applying this rule to the pair 36 : 5, the square root of 36 is 6, and subtracting 2 yields 4, which does not match the given second number 5.

Explanation

The given pattern follows the relation:

Second number = (First number + Third number) × 3

Applying this formula to each row:

First row: (5 + 8) × 3 = 13 × 3 = 39

Second row: (7 + 5) × 3 = 12 × 3 = 36

Third row: (11 + 9) × 3 = 20 × 3 = 60

Explanation

The relationship between the numbers in each pair follows the formula y = x(x + 10), where x is the first number and y is the second number.

For the first pair: 6 × (6 + 10) = 6 × 16 = 96

For the second pair: 8 × (8 + 10) = 8 × 18 = 144

Applying the same formula to the third pair: 5 × (5 + 10) = 5 × 15 = 75

Explanation

To arrange the given words in alphabetical order as they would appear in a dictionary, we compare them letter by letter from left to right.

All five words begin with the letters Ca. Comparing the third letters of the words, we have l in Calcium, Calculate, and Calendar, r in Carrot, and t in Catalyst. Since l comes before r and t in the alphabet, the three words starting with Cal must be ordered first.

Among Calcium, Calculate, and Calendar, the fourth letters are c in Calcium and Calculate, and e in Calendar. Since c comes before e, Calcium and Calculate precede Calendar. Comparing the fifth letters of Calcium (i) and Calculate (u), i comes before u. This places Calcium first, Calculate second, and Calendar third (3, 4, 5).

For the remaining two words, Carrot and Catalyst, the third letter r in Carrot comes before the third letter t in Catalyst. This places Carrot fourth and Catalyst fifth (2, 1).

Putting it all together, the correct alphabetical sequence is 3, 4, 5, 2, 1.

Explanation

We can analyze the validity of each conclusion using Venn diagrams.

For Conclusion I (Some suns are planets): There is no direct relationship defined between suns and planets in the statements. Planets only share an intersection with stars, while suns contain moons. We can easily construct a scenario where the set of suns and the set of planets are completely disjoint. Therefore, Conclusion I does not logically follow.

For Conclusion II (No sun is a star): Although no moon is a star and all moons are inside the set of suns, the remaining portion of suns that are not moons can still overlap with stars. Since a partial overlap between suns and stars is possible, the definite claim that no sun is a star does not logically follow.

For Conclusion III (No planet is a moon): While we know that some stars are planets and no star can be a moon, the portion of planets that are not stars can still overlap with moons. Since there is no restriction preventing planets and moons from intersecting, Conclusion III does not logically follow.

Explanation

The relationship followed by the other pairs is that the second number is obtained by multiplying the first number by 2 and then subtracting 2, which can be represented as y = 2x - 2.

For the pair 15:210, applying this mathematical operation yields 15 × 2 - 2 = 28, which is not equal to 210. Because this pair deviates from the common pattern followed by the rest, it is the odd number pair.

Explanation

Analyzing the positions of the letters in the English alphabet:

For the first letter of each cluster: T (20) → S (19) → R (18) → Q (17). The sequence decreases by 1 each time, making the next letter P (16).

For the second letter of each cluster: V (22) → U (21) → T (20) → S (19). The sequence decreases by 1 each time, making the next letter R (18).

For the third letter of each cluster: X (24) → W (23) → V (22) → U (21). The sequence decreases by 1 each time, making the next letter T (20).

Combining these yields the letter-cluster PRT.

Explanation

The pattern followed by the number pairs is that the second number is obtained by multiplying the first number by 5 and then subtracting 5 from the product.

This relation can be represented by the formula: y = (x × 5) - 5

For the first pair: (19 × 5) - 5 = 95 - 5 = 90

For the third pair: (13 × 5) - 5 = 65 - 5 = 60

Applying the same logic to the middle pair with the first term 25: (25 × 5) - 5 = 125 - 5 = 120

Explanation

In the sport of Golf, the primary instrument used to strike the ball is a golf stick (colloquially used for a golf club). Similarly, in Cricket, the primary instrument used to strike the ball is a bat. The relationship is established between a sport and its corresponding equipment used to hit the ball.

Explanation

Applying the operators given in option B, which are -, ×, =, and -, to the positions of the * signs in the equation gives:

127 - 13 × 3 = 129 - 41

Using the BODMAS rule, the multiplication is performed first on the left side of the equation:

13 × 3 = 39

Substituting this value back into the equation yields:

127 - 39 = 129 - 41

Simplifying both sides:

LHS: 127 - 39 = 88 RHS: 129 - 41 = 88

Since both sides are equal to 88, the equation is balanced.

Explanation

According to the given code, the letters represent the following mathematical operators: A represents + B represents × C represents - D represents ÷

Substituting these operators into the given equation: 17 + (31 × 3) - (64 ÷ 8) + 41 - (21 × 4)

Applying the BODMAS rule to solve the operations within the brackets first: 31 × 3 = 93 64 ÷ 8 = 8 21 × 4 = 84

Now, rewriting the equation with these values: 17 + 93 - 8 + 41 - 84

Performing the addition operations: 17 + 93 + 41 = 151

Performing the subtraction operations: 151 - 8 - 84 = 59

Explanation

The coding scheme divides the letters of the word into consecutive pairs of two, replaces each letter with its opposite alphabet pair (where the sum of the numerical positions of the original and opposite letter is 27), and then swaps their positions within each pair.

In MOTHER: Pair 1: MO has opposite letters NL. Swapping their positions gives LN. Pair 2: TH has opposite letters GS. Swapping their positions gives SG. Pair 3: ER has opposite letters VI. Swapping their positions gives IV. Combining these gives LNSGIV.

In FATHER: Pair 1: FA has opposite letters UZ. Swapping their positions gives ZU. Pair 2: TH has opposite letters GS. Swapping their positions gives SG. Pair 3: ER has opposite letters VI. Swapping their positions gives IV. Combining these gives ZUSGIV.

Applying this logic to WONDER: Pair 1: WO has opposite letters DL. Swapping their positions gives LD. Pair 2: ND has opposite letters MW. Swapping their positions gives WM. Pair 3: ER has opposite letters VI. Swapping their positions gives IV.

Combining these three pairs gives LDWMIV.

Explanation

Substituting the mathematical signs from option C (−, +, =, ×) into the given expression yields:

99 − 25 + 10 = 12 × 7

Evaluating the Left Hand Side (LHS): 99 − 25 + 10 = 74 + 10 = 84

Evaluating the Right Hand Side (RHS): 12 × 7 = 84

Since both sides equal 84, the equation is balanced.