Question

in a class of 100 student the average weight is 30 kg if the average weight of the girl is 24 kg and that of the boys is 32 kg then what is the number of girls in class
1) 25
2) 26
3) 27
4) 28​

Answer 1

Answer:

Ur final answer is 27 okkkkk

Answer 2

Dear Student,

◆ Answer -

(1) 25 girls

● Explaination -

Let x be no of girls, then no of boys is 100-x.

Average of 100 students is calculated by -

Overall average = (no of boys × boys' average + no of girls × girls' average) / total no of students

30 = [(100-x)×32 + x×24] / 100

30 × 100 = 3200 - 32x + 24x

3000 = 3200 - 8x

8x = 3200 - 3000

x = 200 / 8

x = 25 girls

Hence, number of girls in class is 25.

Thanks dear. Hope this helps you..