Which two numbers should be interchanged to make the given equation correct?
79 – 43 + (23 + 75) × 3 – (30 ÷ 15) × 4 = 175
(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: C
Explanation
The correct answer is option 3 i.e. 75 and 30.
Given equation: 79 – 43 + (23 + 75) × 3 – (30 ÷ 15) × 4 = 175
Option 3) 75 and 30
On interchanging the numbers:
79 – 43 + (23 + 30) × 3 – (75 ÷ 15) × 4 = 175
79 - 43 + 159 - 20 = 175
238 - 63 = 175
175 = 175