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    Question

    The sum of the ages of C and D after 10 years will be

    100 years. If the ratio of their present ages is 9:7, find the difference between their ages.
    A 3 yrs Correct Answer Incorrect Answer
    B 7 yrs Correct Answer Incorrect Answer
    C 10 yrs Correct Answer Incorrect Answer
    D 8 yrs Correct Answer Incorrect Answer

    Solution

    Let the present ages of C and D be 9x and 7x years.
    Sum of their present ages = 100 - 20 = 80 years
    ATQ,
    (9x + 7x) = 80
    16x = 80
    So, x = 5
    Difference between their present ages = (9x - 7x) = 2x = 10 years

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