the mean weight of 60 students in class is 40 kg.the mean weight of boys is 50kg while that of girls is 30kg.find the number of boys and girls
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Mean weight of 60 students= 40 kg
Mean weight of boys= 50kg
Mean weight of girls = 30 kg
Total weight of all the students is z
z/60= 40
z= 60 multiplies by 40
2400kgs
Now, let the number of boys be x.
Mean weight of boys is 50 kgs
Total weight of boys is 50x
Mean weight of girls is 30 kgs
Total weight of girls is 30(60-x)
2400= 50x + 30(60-x)
2400-1800= 20x
600/20= x
x= 30
The number of boys in the class is 30
The number of girls in the class is 60-30
which is 30.
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