Question
The average weight of 14 students in a class is 20 kg.
If a student leaves the class, the average weight of the class drops by 4 kg. Find the weight of the student (in kg) who left the class.Solution
The average weight of 14 students =20kg. Total weight =20×14=280kg. After a student leaves a class then average =20-4 =16kg Total weight of 13 students =13×16=208 kg. Weight of a student who left the class =280-208=72 kg.
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