The mean weight of 150 students in a certain class is 30kg. The mean weight of the boys in the class is 40kg and that of the girls is 25kg. Find the number of boys and girls in the class
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Answer:
50 and 100.
Step-by-step explanation:
Let the numbers of boys be x.
Number of girls = 150-x
Total weight of 150 students = 150*30 = 4500 kg.
40x + 25(150-x) = 4500
15x + 3750 = 4500
15x = 750
x = 50.
Thus number of boys = 50.
Number of girls = 150 - 50 = 100
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