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    Question

    20 men working 6 hours a day can paint a building in 25

    days. If 30 men work 8 hours a day, how many days will it take to paint the building?
    A 7.2 days Correct Answer Incorrect Answer
    B 12.5 days Correct Answer Incorrect Answer
    C 14.2 days Correct Answer Incorrect Answer
    D 18.5 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the efficiency of a man = 'x' units/hour

    Total work = 20 × x × 6 × 25 = 3000x units

    Number of days taken by 30 men working 8 hours/day =

    = 3000x ÷ (30 × x × 8)

    = 3000x ÷ 240x = 12.5 days

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