Question

the number of boys and girls in a class are in ratio of 7:5. the number of boys is 8 more than girls what is the total strength of the class?

                                                                                                                                                             

 

Answer 1

Let the no. of girls be 5x
No. of boys=7x
According to the question
5x+8=7x
7x-5x=8
2x=8
x=8/2
x=4
No. of girls=5*4=20
no. of boys=7*4 or 5*4+8=28
Hence the total strength of the class is 20+28=48

Answer 2

b:g=7:5
b=8+g
=>(8+g):g=7:5
=>g=20

Hence,b=8+g
=>b=8+20=28

therefore,there are 28 boys and 20 girls in the class.
=>total strength in the class=28+20
                                             =48