Question

In a class there were 9 boys and some girls in a test the mean score obtained by the boys was 12 and that of girls was 14.overall average was 13.1...what was total no of students

Answer 1

This is ur answer. Hope u got it

Answer 2

Answer:

ans is 20

Step-by-step explanation:

13.1=9×(12)+g×(14)/9+g

117.9+13.1g=108+14g

9.9=0.9g

g=11

total students in class = b+ g

=9+11

=20