What is to be added to 15% of 180 so that the sum is equal to 20% of 360?

A. 45

B. 40

C. 60

D. 50

Answer: Option A

Solution(By Examveda Team)

$$\eqalign{ & {\text{Let be the number is }}x \cr & 180 \times \frac{{15}}{{100}} + x = \frac{{360 \times 20}}{{100}} \cr & 27 + x = 72 \cr & x = 72 - 27 \cr & x = 45 \cr} $$