By interchanging the two signs ÷ and + and two numbers 9 and 12 (NOT digits), which of the following equations will NOT be correct?
I. 12 × 2 − 72 + 9 ÷ 57 = 69
II. 169 + 13 × 12 ÷ 3 − 9 = 108
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Neither I nor II.
Given conditions: ÷ and + and two numbers 9 and 12
After interchanging the expression becomes:
I. 12 × 2 − 72 + 9 ÷ 57 = 69
= 9 × 2 − 72 ÷ 12 + 57
= 69 is equal to 69.
II. 169 + 13 × 12 ÷ 3 − 9 = 108
= 169 ÷ 13 × 9 + 3 − 12
= 108 is equal to 108.