Multiple Choice Questions on A amp B can separately finish the work in 30 days and 50 days respectively They worked together and ........... for IBPS RRB - Office Assistant/ Clerical Exam Preparation

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Multiple Choice Questions

A amp B can separately finish the work in 30 days and 50 days respectively They worked together and ...........

Quantitative Aptitude(IBPS RRB CL) Time and work
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    A & B can separately finish the work in 30 days and 50 days respectively. They worked together and A left the work, so B complete the remaining work in 10 days. Find after how many days A left the work?

    10days

    Incorrect Answer

    12days

    Incorrect Answer

    15days

    Correct Answer

    20days

    Incorrect Answer
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    Explanation:

    Solution: 
    A = 30………..5
    B = 50……….3    (LCM = 150)
    A+ B = 8
    B’s work in 10days = 3*10 =30
    Means they together did ……120
    120/8= 15days

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