Question

The mean weight of 150 students in a certain class is 30 kg. The mean weight of the boys
in the dass is 40 kg and that of the girls is 25 kg. Find the number of boys and girls in the
class​

Answer 1

Answer:

total weight= 150 × 30 = 4500

mean we of boys= 40

let there be n boys

so there total weight will be 40n

and the no of girls will be 150- n

so there total weight will be 150-n × 25= 3750-25n

so 3750-25n + 40n =4500

so n would be 50

so no of girls would be 150-50= 100

Answer 2

Answer:

i think this answer is correct ok