The ratio between the present age of A and B is 7:4. The ratio between the age of A and B four years ago is 2:1. What are the ratio age of A and B four years hence

A 3:4

B 3:5

C 5:8

D 8:5

Correct Answer: Option D

According to condtion:
7x-4/4x-4 = 2/1
=>7x-4= 8x-8
x=8-4=4
Present age=7(4):4(4)=28:16
4 Years hence=32:20=8:5