Question

the age of A and B are in ratio 3:4. five years later the sum of there age will be 31 years. what are there present age

Answer 1

I think this is the answer ..

Answer 2

let A and B the present ages

4A=3B

A+5+B+5 =31
A+B=21

3B/4 +B =21
3B+4B = 21X4
B=12

A = 36/4 = 9