Question
Present ages of A and B are in the ratio 5:7. After 8 years, the ratio becomes 7:9. Find A's present age.
Solution
Let present ages be 5x and 7x. After 8 years: (5x + 8)/(7x + 8) = 7/9 9(5x + 8) = 7(7x + 8) 45x + 72 = 49x + 56 16 = 4x x = 4 A's present age = 5x = 20 years
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