What if their are 3 girls and 7 boys if their are 50 students how many boys are their?

Question

This is for my homework

Answer 1

I think you meant to say that there are 3 girls for every 7 boys. At least, that's the question I am going to answer. :)

Let x = the number of boys

Let 50 - x = the number of girls

 

Girls/Boys: 3 = 50 - x       Cross Multiply

                    7        x

3x = 350 - 7x

10x = 350

x = 35 boys

50 - x = 15 girls

 

Check: 15/35 = 3/7