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The mean weight of 60 students of a class is 40kg. the mean weight of boys is 50kg while that of the girls is 30kg.find the numbers of boys and girls in

the class. fast plz..................!!!!!


I thin its ans is
80 boys
50 girls
0 0 0
Let take boy = x
girl = y
sigma Xi1 = (50)x
sigma Xi2 = (30)y
mean of 60 students =
(50x +30y)/X+Y
then you will get your answer as given ahead
0 0 0
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