Multiple Choice Questions on A and B together can do a piece of work in 9 days If A does thrice the work of B in a given time the........... for SSC CGL Exam Preparation

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Multiple Choice Questions

A and B together can do a piece of work in 9 days If A does thrice the work of B in a given time the...........

Quantitative Aptitude (CGL) Time and work
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    A and B together can do a piece of work in 9 days. If A does thrice the work of B in a given time, the time A alone will take to finish the work is

    4 days

    Incorrect Answer

    6 days

    Incorrect Answer

    8 days

    Incorrect Answer

    12 days

    Correct Answer
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    Explanation:

    (A + B)’s efficiency= 100/9 (= 11.11%).
    Suppose, the efficiency of B= x%; hence, the efficiency of A= 3x;
    x + 3x= 100/9; x= (25/9)%. => The efficiency of A= (25/3)%.
    A will do this work in = 100/(25/3) = 12 days

    By: MIRZA SADDAM HUSSAIN
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