Quantitative Aptitude Ratio and Proportion Age

The ratio of-the present ages of two boys is 3 ∶ 4. After 3 years, the ratio of their ages will be 4 ∶ 5. The ratio of their ages after 21 years will be:

1

14 ∶ 17

2

17 ∶ 19

3

11 ∶ 12

4

10 ∶ 11

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