find the average of class 5th in mathematics is the total mark is 24010 of the classes 28 under the two place of the decimal
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Mean weight of 7 boys = 56 kg.
Total weight of 7 boys = (56 × 7) kg = 392 kg.
Total weight of 6 boys = (52 + 57 + 55 + 60 + 59 + 55) kg
= 338 kg.
Weight of the 7th boy = (total weight of 7 boys) - (total weight of 6 boys)
= (392 - 338) kg
= 54 kg.
Hence, the weight of the seventh boy is 54 kg.
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