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    Question

    20 boys can dig a pit in 15 days, while 5 men can dig

    the same pit in 6 days. In how many days will 10 boys and 1 man together dig the pit?
    A 12 days Correct Answer Incorrect Answer
    B 10 days Correct Answer Incorrect Answer
    C 18 days Correct Answer Incorrect Answer
    D 15 days Correct Answer Incorrect Answer

    Solution

    20B × 15 = 5M × 6
    Or, 1M = 10B
    Therefore, 10B + 1M = 10B + 10B = 20B
    Therefore, 20 boys can complete the work in 15 days
    So, 20 boys will complete in  15 days .

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