Which two numbers (not digits) should be interchanged to make the given equation correct?
21 × 8 – 18 + (64 ÷ 2) + 32 = 64
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 8 and 2.
21 × 8 – 18 + (64 ÷ 2) + 32 = 64
After interchanging 8 and 2 we get: 21 × 2 – 18 + (64 ÷ 8) + 32 = 64
= 21 × 2 – 18 + (64 ÷ 8) + 32
= (21 × 2) – 18 + 8 + 32
= (42 + 8 + 32) – 18
= 82 - 18
= 64