Multiple Choice Questions on A alone can complete a work in 5 days more than A B together and B alone can complete a work in 45 d........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A alone can complete a work in 5 days more than A B together and B alone can complete a work in 45 d...........

Quantitative Aptitude ( CCS) Time and work
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    A alone can complete a work in 5 days more than A+B together and B alone can complete a work in 45 days more than A+B together. Then in how many days A and B together can complete the work?

    16 days

    Incorrect Answer

    21 days

    Incorrect Answer

    15 days

    Correct Answer

    20 days

    Incorrect Answer
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    Explanation:

    Answer & Explanation
    C) 15 days
    Explanation: 
    Shortcut = v5×45 = 15
    OR
    Let (A+B) can do in x days, so
    1/(x+5) + 1/(x+45) = 1/x
    Solve, x2 = 225, x = 15

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