Multiple Choice Questions on A can do a piece of work in 12 days which B can do in 18 days They begin together but 2 days before ........... for IBPS RRB - Officers Exam Preparation

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Multiple Choice Questions

A can do a piece of work in 12 days which B can do in 18 days They begin together but 2 days before ...........

Quantitative Aptitude(IBPS RRB PO) Time and work
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    A can do a piece of work in 12 days which B can do in 18 days. They begin together but 2 days before the completion of the work, A leaves off. The total number of days to complete the work is?

    42/5

    Correct Answer

    7

    Incorrect Answer

    8

    Incorrect Answer

    43/5

    Incorrect Answer

    None of these

    Incorrect Answer
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    Explanation:

    Let total work = 36 units ( LCM of 12 and 18)

    Efficiency of A =36/12 = 3 units/day

    Efficiency of B =36/18 = 2 units/day

    1 day work of A and B together = 3 + 2 = 5 units/day

    Last 2 days' work of B = 2 x 2 = 4 units

    Hence, rest work compelted together = 36 – 4 = 32 units.

    Hence, days the rest work is completed by A and B = 32/5days

    So, total days = 2 +32/5 = 42/5days

    By: Munesh Kumari
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