Which two numbers should be interchanged to make the given equation correct?
(99 − 42 + 11) + (36 ÷ 6) × 7 − 50 = 73
(NOTE: Numbers must be interchanged and not the constituent digits e.g. if 2 and 3 are to be interchanged in the equation 43 × 3 + 4 ÷ 2, then interchanged equation is 43 × 2 + 4 ÷ 3)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 42 and 36.
Given: (99 − 42 + 11) + (36 ÷ 6) × 7 − 50 = 73
On interchanging numbers 42 and 36,
(99 − 36 + 11) + (42 ÷ 6) × 7 − 50 = 73
(63 + 11) + 7 × 7 - 50 = 73
74 + 49 - 50 = 73
74 - 1 = 73
73 = 73