Question

60 kg.
find of age
Mean weight of students in a class is 48 kgs.
It mean weight of girl. Students is 60 kgs
and that of boys is 60
boys and girls (6) If there
are hold total
75 students find the number of
each.
of​

Answer 1

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

Answer

Let x be the number of boys, then the number of girls will be (60−x).

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

The mean weight of girls is 30 kg, then the total weight of girls will be 30(60−x)=1800−3 0 x.

The mean weight of 60 students is 40 kg, so

totalno.ofstudents

weightofgirls+weightofboys

=40

60

1800−3 0 x+50x

=40

x=

20

600

x=30

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