Multiple Choice Questions on Abhishek can do a piece of work in 10 days Babita can do it in 20 days With the help of Harilal they........... for CDS Exam Preparation

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Multiple Choice Questions

Abhishek can do a piece of work in 10 days Babita can do it in 20 days With the help of Harilal they...........

Quantitative Aptitude (CDS) Time and work
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    Abhishek can do a piece of work in 10 days, Babita can do it in 20 days. With the help of Harilal, they finish the work in 4 days. In how many days Harilal alone can do the whole work?

    7days
     

    Incorrect Answer

    6days
     

    Incorrect Answer

    4days
     

    Correct Answer

    5days

    Incorrect Answer
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    Explanation:

    Efficiency of Abhishek = 10%
    Efficiency of Babita = 5%
    Efficiency of Abhishek, Babita and Harilal = 25%
    Efficiency of Harilal = (efficiency of Abhishek,Babita and Harilal)-(efficiency of Abhishek and Babita)
    = (40)-(10+5) = 25%
    Number of days required by Harilal to work alone = 100/25 = 4 days

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