Which of the following interchange of numbers and mathematical signs would make the given equation correct?
72 ÷ 8 × 9 − 36 + 20 = 80
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 8 and 9, + and −.
Given equation: 72 ÷ 8 × 9 − 36 + 20 = 80
Option 4: 8 and 9, + and −
After interchanging the expression becomes:
72 ÷ 9 × 8 + 36 - 20 = 80
8 × 8 + 36 - 20 = 80
64 + 36 - 20 = 80
100 - 20 = 80
80 = 80