PROPORTIONS

Question

There are 105 members of the high school marching band. For every 3 boys there are 4 girls. Which proportion represents how many boys are in the marching band?

 

 

Answer 1

For every 3 boys, there are 4 girls. We can rephrase this to say: out of each group of 7 band members, 3 are boys and 4 are girls. Therefore the ratio of boys:bandmembers is 3:7, 3/7.

 

As a proportion (3 boys)/(7 members) = (x boys)/(105 members)

 

You can cross multiply to solve this equation.