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    Question

    The average rainfall recorded over the first three days

    of a week was 85 cm, whereas the average for the last three days was 92 cm. If the weekly average rainfall was 88 cm, determine the rainfall on the third day.
    A 50 cm Correct Answer Incorrect Answer
    B 85 cm Correct Answer Incorrect Answer
    C 20 cm Correct Answer Incorrect Answer
    D 30 cm Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total rainfall for the first three days = 85 × 3 = 255 cm

    Total rainfall for the last three days = 92 × 3 = 276 cm

    Total rainfall in the entire week = 88 × 7 = 616 cm

    Rainfall on the third day = {(255 + 276) – 616} = 85 cm

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