OK. So, 7/10 of a band is boys and there are 28 of them. you want to know what fraction the girls are? Well, the fraction of girls in the band would be 3/10. If you wanted to find the number of girls from the given information, you should do it like this:

1. Find the total amont of band members by solving the equation .7x=28. x=40
2. Then, subtract the number of boys from the total number of band members: 40-28=12
3. The number of girls is 12. To double check, multiply .3 and 40 and you should get 12.

I hope this answers the question.

7*28=196

196/10=19.6

to solve these you multiply the top and divide the bottom

I just relalized mister martinez is correct

7/10 x=28

.7x=28

divide both sides by .7

x=28/.7

x=40

so the total are 40 and 40-28=12

so 12 girls in the band.

I was focusing on the title, sorry.