Question

average weight of 25 boys in a class is 48 kgs. The average weight of the class of 40 students is 45 kgs. What is the average weight of the 15 girls in the class

Answer 1

So the ratio of boys to girls is 5 is to 3

Answer 2

hi

Average weight of 25 boys in a class is 48 kgs

x/25 = 48

x = 25*48

=> x = 1200 kg [ boys]

The average weight of the class of 40 students is 45 kgs

x/40 = 45

x = 40*45

=> x= 1800

no.of girls left out = total - boys

40 - 25

=> 15

boys overall weight  = 1200kg

class overall wieght = 1800kg

so the overall weight of 15 girls  = 1800 - 1200


 overall weight of 15 girls = 600ks

thier average

=>600/15

=> 40 kgs

average of 15 girls  = 40 kgs

hope it helps u

:)