Which two signs and two numbers should be interchanged to make the given equation correct?
12 × 5 + 7 ÷ 4 – 6 = 25
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. ÷ and −, 4 and 12.
Given equation: 12 × 5 + 7 ÷ 4 – 6 = 25
Option 1: × and +, 12 and 4
After interchanging the expression becomes:
= 4 + 5 × 7 ÷ 12 – 6 = 25
= 0.9166 is not equal to 25.
Option 2: ÷ and −, 4 and 12
After interchanging the expression becomes:
= 4 × 5 + 7 - 12 ÷ 6 = 25
= 4 × 5 + 7 - 2
= 20 + 7 - 2
= 27 - 2
= 25 is equal to 25.
As we have found our answer, so, there is no need of checking other options.
Hence, option 2 is the correct answer.