Which two signs should be interchanged to make the equation mathematically correct?
120 + 18 × 40 – 10 ÷ 20 = 172
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. ÷ and -.
Given equation: 120 + 18 × 40 – 10 ÷ 20 = 172
Option 1: ÷ and -
After interchanging the expression becomes:
= 120 + 18 × 40 ÷ 10 - 20 = 172
= 120 + 18 × 4 - 20
= 120 + 72 - 20
= 192 - 20
= 172 = 172
As we have found our answer, there is no need to check further options.
Hence, ÷ and– is the correct answer.