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    Question

    During a week, the first six days recorded an average

    rainfall of 140 cm, and the last six days had an average of 148 cm. Given that the weekly average was 145 cm, find the rainfall on the sixth day.
    A 454 cm Correct Answer Incorrect Answer
    B 585 cm Correct Answer Incorrect Answer
    C 329 cm Correct Answer Incorrect Answer
    D 713 cm Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total rainfall for the first six days = 140 ├Ч 6 = 840 cm

    Total rainfall for the last six days = 148 ├Ч 6 = 888 cm

    Total rainfall for the week = 145 ├Ч 7 = 1015 cm

    Rainfall on the sixth day = {(840 + 888) тАУ 1015} = 713 cm

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