Question

The mean weight of 60 students in class
40 kg. The mean weight of boys is 50 kg
while that of girls is 30 kg. Find the number
of boys and girls in the class
​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

Let x be the number of boys,

then number of girls will be (60 - x)

The mean weight of boys is 50kg, then the total weight of boys will be 50x

The mean weight of girls is 30kg,then the total weight of girls will be 30( 60 - x) = 1800 - 30x

the mean weight of 60 students is 40kg, So

weight of girls + weight of boys

------------------------------------------------ = 40

total no. of students

1800 - 30x + 50x

------------------------------- = 40

60

X = 600

-----

20

X = 30

So, the number of boys is 30 and the number of girls is ( 60 - 30) = 30.