Which two numbers (not digits) should be interchanged to make the following equation correct?
21 × 3 − 10 + 4 ÷ 7 = 5
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 21 and 4.
Given equation: 21 × 3−10 + 4 ÷ 7 = 5
Option 1: 21 and 4
After interchanging;
4 × 3−10 + 21 ÷ 7 = 5
4 × 3−10 + 3 = 5
5 = 5