Which two mathematical signs should be interchanged to make the given equation correct?
(75 + 15) × 27 × 1 – 9 ÷ 7 × (135 + 3) – 10 ÷ (189 + 63) = 434
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. + and ÷.
Given equation: (75 + 15) × 27 × 1 – 9 ÷ 7 × (135 + 3) – 10 ÷ (189 + 63) = 434
Option 1: + and ÷
After interchanging the expression becomes:
(75 ÷ 15) × 27 × 1 – 9 + 7 × (135 ÷ 3) – 10 + (189 ÷ 63) = 434
5 × 27 × 1 – 9 + 7 × 45 – 10 + 3 =434
135 – 9 + 315 – 10 + 3 = 434
434 = 434