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    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?
    A 10 yrs Correct Answer Incorrect Answer
    B 8 yrs Correct Answer Incorrect Answer
    C 4 yrs Correct Answer Incorrect Answer
    D 2 yrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    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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