Multiple Choice Questions on A amp B can do a work in 60days B amp C can do same work in 30 days Find in how many days A alone ca........... for Bihar civil service (BPSC) Preparation

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Multiple Choice Questions

A amp B can do a work in 60days B amp C can do same work in 30 days Find in how many days A alone ca...........

Quantitative Aptitude (CSC) Time and work
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    A & B can do a work in 60days. B & C can do same work in 30 days. Find in how many days A alone can do the work if C & A can do that work in 40 days?

    240

    Correct Answer

    360

    Incorrect Answer

    120

    Incorrect Answer

    480

    Incorrect Answer
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    Explanation:

    Solution: 
    LCM  = 120
    A+B=60 ………120/60 = 2
    B+C=30 …………………… 4
    C+A=40 …………………… 3
    2(A+B+C) = 9
    A+B+C= 9/2
    (A+B+C) – (B+C) = 9/2 – 4= 1/2
    120/1/2= 240 days Ans.

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