Which two numbers (not individual digits) should be interchanged to make the given equation correct?
3 × 9 × 7 – 18 × 4 + (72 ÷ 8) – 21 = 186
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2, i.e., 3 and 4.
Option 2: 3 and 4
4 × 9 × 7 – 18 × 3 + (72 ÷ 8) – 21 = 186
36 × 7 - 54 + 9 - 21 = 186
252 - 54 + 9 - 21 = 186
261 - 54 - 21 = 186
261 - 75 = 186
186 = 186