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.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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