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    Question

    The average rainfall in a city for the first 7 days of a

    month is 12 mm per day. To have an average of 20 mm per day over 14 days, what should be the average rainfall in the remaining days?
    A 18 Correct Answer Incorrect Answer
    B 11 Correct Answer Incorrect Answer
    C 35 Correct Answer Incorrect Answer
    D 28 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total rainfall required = 20 × 14 = 280 mm

    Rainfall in 7 days = 12 × 7 = 84 mm

    Required rainfall = 280 - 84 = 196 mm

    Required average rainfall in remaining days = 196 ÷ 7 = 28 mm per day

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