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Answer: (A) 15 + 5÷ 1 - 9× 4 = 70
Explanation
To determine which equation is incorrect after interchanging the signs × and -, we substitute these signs in the given expression 15 + 5 ÷ 1 - 9 × 4 = 70. Following the interchange, the equation becomes 15 + 5 ÷ 1 × 9 - 4 = 70.
Applying the BODMAS rule (Brackets, Orders, Division, Multiplication, Addition, Subtraction), we first perform the division: 5 ÷ 1 = 5. The expression then becomes 15 + 5 × 9 - 4. Next, we perform the multiplication: 5 × 9 = 45, resulting in 15 + 45 - 4. Moving to addition, 15 + 45 = 60. Finally, we subtract 4 from 60, which gives 60 - 4 = 56.
Since the calculated value of the Left Hand Side (LHS) is 56 and the given Right Hand Side (RHS) is 70, the equation is not correct because 56 ≠ 70.