The ratio of present age of Abhi and Ronak is 3 : 4. 12 years from now, the ratio of their ages will be 5 : 6. If Nishan is 8 years younger than Ronak, then find ratio of age of Nishan and Ronak 4 years hence?

7 : 5

A  :   R

3  :   4

         ↓+2R = 12 years   ⇒ 1R = 6 years                

5  :   6  

Hence,

Ronak present age = 4 × 6 = 24 years 

Nishan is 8 years younger to Ronak, so Nishan age = 24 - 8 = 16 yeras

Ronak's age 4 years hence = 24 + 4 = 28 years 

Nishan's age 4 years hence = 16 + 4 = 20 years

Required ratio,   R :  N = 28 : 20 = 7 :  5