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    Question

    50 children can decorate a hall in 25 days. If 25

    children began decorating and after 10 days ‘z’ additional children joined, completing the decoration in 20 more days, find ‘z’.
    A 22 Correct Answer Incorrect Answer
    B 23 Correct Answer Incorrect Answer
    C 24 Correct Answer Incorrect Answer
    D 25 Correct Answer Incorrect Answer
    E 26 Correct Answer Incorrect Answer

    Solution

    Total work = 50 × 25 = 1250 units Work completed by 25 children in 10 days = 25 × 10 = 250 units Remaining work to be completed by (25 + z) children = 1250 – 250 = 1000 units Therefore, (25 + z) × 20 = 1000 Or, 25 + z = 1000 / 20 Or, 25 + z = 50 Or, z = 50 – 25 = 25 Number of children added = 25

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