The average weight of 50 boys in a class is 45 kg. when one boy leaves the class, the average reduces by 100g. find the weight of the boy who left the class.
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6
44900/49=990
Boys weight =1.80kg
Boys weight =1.80kg
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wrong answer
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Solution :-
Total number of boys in class = 50
Average weight = 45 kg
Total weight of 50 boys = 50*45
= 2250 kg
Now, 1 boy leaves the class, the number boys remaining = 50 - 1
= 49
Average weight reduced after leaving = 100 g or 0.1 kg
Average weight of 49 boys after 1 boy leaves = 45 - 0.1 = 44.9 kg
Total weight of 49 boys = 44.9*49
= 2200.1 kg
Now,
Weight of the boy who left the class = total weight of 50 boys - total weight of 49 boys
= 2250 kg - 2200.1 kg
= 49.9 kg
So, the weight of the boy is 49.9 kg, who left the class.
Total number of boys in class = 50
Average weight = 45 kg
Total weight of 50 boys = 50*45
= 2250 kg
Now, 1 boy leaves the class, the number boys remaining = 50 - 1
= 49
Average weight reduced after leaving = 100 g or 0.1 kg
Average weight of 49 boys after 1 boy leaves = 45 - 0.1 = 44.9 kg
Total weight of 49 boys = 44.9*49
= 2200.1 kg
Now,
Weight of the boy who left the class = total weight of 50 boys - total weight of 49 boys
= 2250 kg - 2200.1 kg
= 49.9 kg
So, the weight of the boy is 49.9 kg, who left the class.
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