The ratio of the present ages of A and B is 5 : 7. Ten years later, the ratio becomes 7 : 9. What is A's present age?
25 years
Let the present ages be 5x and 7x.
After ten years: (5x + 10) : (7x + 10) = 7 : 9, so 9(5x + 10) = 7(7x + 10).
45x + 90 = 49x + 70, so 4x = 20 and x = 5.
A's present age = 5 × 5 = 25 years.
Hence, the answer is 25 years.
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