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    Question

    The average age of three children is 20 years. If their

    ages are in the ratio 3:5:7. Find the age of the youngest child.
    A 16 years Correct Answer Incorrect Answer
    B 10 years Correct Answer Incorrect Answer
    C 14 years Correct Answer Incorrect Answer
    D 12 years Correct Answer Incorrect Answer

    Solution

    Total age of three children = 20 × 3 = 60 years Let their ages be 3x, 5x and 7x respectively. => 3x + 5x + 7x = 60 => 15x = 60 => x = 4 Therefore the age of youngest child = 4 × 3 = 12 years

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