Question

Sum of ages of A and B are 30 years and five years hence A will be three times as old as B.Find their present ages​

Answer 1

A + B = 30 (1)
After 5 yrs ,
(A+5)=3(B+5).
A-3B =10 (2)
Solving 1 and 2
4B= 20
B=5
A=25