The ratio of the age of P five years ago to the age of Q five years hence is 2: 3. The ratio of the present age of Q to the present age of R is 11: 15. If the sum of the present age of P and R is 120, If the age of P y years after and the age of Q 5 years after are in the ratio 1: 1. Find the value of y.
1
20
2
18
3
15
4
12
5
10