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Seven years ago, the ratio of the ages o...

Seven years ago, the ratio of the ages of A and B was 4 : 5. Eight years hence, the ratio of the ages of A and B will be 9 : 10. What is the difference between their present ages in years?
सात साल पहले, A और B की आयु का अनुपात 4: 5 था। आठ वर्षो बाद, A और B की आयु का अनुपात 9: 10 होगा। वर्षों में उनकी वर्तमान आयु में क्या अंतर क्या है ज्ञात करे ?

A

3

B

6

C

2

D

4

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