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    Question

    In a town, the average rainfall for the first four days of

    a week was 105 cm, while the average for the last four days was 112 cm. If the weekly average rainfall was 110 cm, determine the rainfall on the fourth day.
    A 54 cm Correct Answer Incorrect Answer
    B 85 cm Correct Answer Incorrect Answer
    C 98 cm Correct Answer Incorrect Answer
    D 71 cm Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total rainfall for the first four days = 105 × 4 = 420 cm

    Total rainfall for the last four days = 112 × 4 = 448 cm

    Total rainfall for the whole week = 110 × 7 = 770 cm

    Rainfall on the fourth day = {(420 + 448) – 770} = 98 cm

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