Which two signs should be interchanged to make the equation mathematically correct?
20 + 34 − 81 × 9 ÷ 2 = 36
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. × and ÷.
Given equation: 20 + 34 − 81 × 9 ÷ 2 = 36
Option 1: × and ÷
After interchanging the expression becomes:
= 20 + 34 − 81 ÷ 9 × 2 = 36
= 20 + 34 − 9 × 2
= 20 + 34 − 18
= 54 - 18
= 36 = 36
As we have found our answer, there is no need to check further options.
Hence, × and ÷ is the correct answer.