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    5. The average age of three children is 21 years. If their ages are in the ratio 3:5:6. Find the age of

    Question

    The average age of three children is 21 years. If their

    ages are in the ratio 3:5:6. Find the age of the youngest child.
    A 12 years Correct Answer Incorrect Answer
    B 15 years Correct Answer Incorrect Answer
    C 13.5 years Correct Answer Incorrect Answer
    D 18 years Correct Answer Incorrect Answer

    Solution

    Total age of three children = 21 ×3 = 63 years Let their ages be 3x, 5x and 6x respectively. => 3x + 5x + 6x = 63 => 14x = 63 => x = 4.5 Therefore the age of youngest child = 3×4.5 = 13.5 years

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