Question:
A ratio of the ages of Mother and son at present is 3:1. After 5 years the ratio will become 5:2. The present age of the son is?
A15 years
B18 years
C19 years
D23 years
Answer:
A. 15 years
Explanation:
The present age be 3x and 1x. After 5 years their ages be 3x + 5 and 1x + 5 (3x+ 5)/(x+5)=5/2 6x + 10 = 5x + 25 x = 15 Age of son is 15 years