Which of the following interchange of signs would make the given equation correct?
52 + 36 ÷ 9 × 3 − 1 = 210
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. × and +.
Given equation: 52 + 36 ÷ 9 × 3 − 1 = 210
Option 1: − and +
After interchanging the expression becomes:
= 52 - 36 ÷ 9 × 3 + 1 = 210
= 52 - 4 × 3 + 1
= 52 - 12 + 1
= 41 is not equal to 210.
Option 2: × and +
After interchanging the expression becomes:
= 52 × 36 ÷ 9 + 3 − 1 = 210
= 52 × 4 + 3 − 1
= 208 + 3 − 1
= 210 is equal to 210.
As we have found our answer, there is no need to check further options.
Hence, option 2 is the correct answer.