Which two number should be interchanged to make the given equation correct?
63 ÷ 21 - 42 + 8 × 7 = 135
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 7 and 21.
63 ÷ 21 - 42 + 8 × 7 = 135
After interchangeing numbers,
(63 ÷7) - 42 + ( 8 × 21) = 135
9 - 42 + 168 = 135
177 - 42 = 135
135 = 135