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    Question

    Sonia and Riya decided to complete a piece of work

    together. Sonia is capable of doing 9 units of work per day, whereas Riya can finish the complete task alone in 18 days. If the total work amounts to 108 units, how many days will they take working together?
    A 21/11 Correct Answer Incorrect Answer
    B 36/5 Correct Answer Incorrect Answer
    C 33/5 Correct Answer Incorrect Answer
    D 23/4 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let, the time taken by Sonia and Riya to do the work be ‘x’ days.

    Units of work done by Riya in a day = 108 / 18 = 6 units

    So, 108 / x = 9 + 6 = 15

    108 = 15x

    x = 108 / 15 or (36/5)

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