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    Question

    A region observed an average rainfall of 130 cm during the

    first four days of a week, while the last four days had an average of 135 cm. If the total weekly average was 133 cm, find the rainfall on the fourth day.
    A 150 cm Correct Answer Incorrect Answer
    B 185 cm Correct Answer Incorrect Answer
    C 129 cm Correct Answer Incorrect Answer
    D 115 cm Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total rainfall for the first four days = 130 ├Ч 4 = 520 cm

    Total rainfall for the last four days = 135 ├Ч 4 = 540 cm

    Total rainfall for the whole week = 133 ├Ч 7 = 931 cm

    Rainfall on the fourth day = {(520 + 540) тАУ 931} = 129 cm

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