The mean weight of 120 students In a class is 56 kg. the mean weight of boys is 60 kg while that of girls is 50 kg. find the number of boys.
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The no. Of boys is 72
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The number of Boys in class is 72.
Let the number of boys in class be x.
Therefore, the number of girls in class is 120-x.
Hence, 56={60x + 50(120-x)}/120
6720=60x + 6000 -50x
x=72.
Hence, the number of boys in class (x) is 72.
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