Question
At present, the ratio of the ages of a father and his son is 5 : 1. After 8 years, the ratio of their ages will become 7 : 3. What is the present age of the son?
Solution
ATQ, Let present ages be: Father = 5x Son = x After 8 years: (5x + 8) / (x + 8) = 7 / 3 3(5x + 8) = 7(x + 8) 15x + 24 = 7x + 56 8x = 32 x = 4 So, son's present age = 4 years Hence, the correct answer is 4 years.
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