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Solution:
Average weight of 35 apples = 50 grams
=> Total weight of 35 apples = 50 × 35 = 1750 grams
Let n apples of 40 grams of weight were removed, then
=1750−40n/35−n=57.5
=>1750 − 40n = 2012.5 − 57.5n
=>57.5n − 40n = 2012.5 − 1750
=>17.5n = 262.5
=>n = 262.5/17.5 =15