Question

the average score of a class of boys and girls in an examination is A. the ratio of boys and girls in the class is 3:1. if the average score of the boys is A+1. find the average score of girl​

Answer 1

Answer:

Avg.score of girls is A-3

Step-by-step explanation:

Let avg. marks of girls be y and boys be x

Given- x:y=3:1

Therefore,x=3y

Now,it is given that avg. Score of boys is A+1

So,A=3x+y/1+3

A=3(A+1)+y/4

4A=3A+3+y

A=3+y

Hence,y=A-3