Which two signs should be interchanged to make the equation mathematically correct?
3 × 144 - 6 ÷ 40 + 20 = 52
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. ÷ and-.
Given equation: 3 × 144 - 6 ÷ 40 + 20 = 52
Option 1: ÷ and -
After interchanging the expression becomes:
3 × (144 ÷ 6) - 40 + 20 = 52
⇒ (3 × 24) - 40 + 20 = 52
⇒ 72 - 40 + 20 = 52
⇒ 92 - 40 = 52
⇒ 52 = 52
Hence, the correct answer is ÷ and-.