Question
The average rainfall over a certain number of days was
24 mm. On the next day, the rainfall was 60 mm and the average increased by 2 mm. Find the total rainfall before that day.Solution
Let the number of days before be 'P'.
Rainfall before = 24P
(24P + 60) / (P + 1) = 26
=> 24P + 60 = 26P + 26
=> 2P = 34 => P = 17
Total rainfall = 24 × 17 = 408 mm
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