Which two signs should be interchanged to make the equation mathematically correct?
136 ÷ 17 + 102 - 3 × 2 = 187
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. ÷ and -.
Given equation: 136 ÷ 17 + 102 - 3 × 2 = 187
Option 1: + and ×
After interchanging the expression becomes:
= 136 ÷ 17 × 102 - 3 + 2 = 187
= 8 × 102 - 3 + 2
= 816 - 3 + 2
= 815 is not equal to 187.
Option 2: ÷ and -
After interchanging the expression becomes:
= 136 - 17 + 102 ÷ 3 × 2 = 187
= 136 - 17 + 34 × 2
= 136 - 17 + 68
= 187 is equal to 187.
As we have found our answer, there is no need to check further options.
Hence, ÷ and - is the correct answer.