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    Question

    A can complete a piece of work in 24 days. He worked for

    21 days and then B finished the remaining work in 5 days. In how many days can A and B together finish the work?
    A 45 days Correct Answer Incorrect Answer
    B 40 days Correct Answer Incorrect Answer
    C 15 days Correct Answer Incorrect Answer
    D 24 days Correct Answer Incorrect Answer

    Solution

    A can complete a piece of work in 24 days. A does the work in 24 days =1 A does the work in 1 day =1/24 A does the work in 21 days = (1/24) ×21=7/8 Remaining work =1-7/8 =1/8 Remaining work finished by B in 5 days =5×8=40days. A and B together finish the work – 24                    40                120 5                        3 =120/5+3 =120/8 =15 days.

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