Question

It costs $1.50 to fill a spherical balloon with a radius of 4 inches full of helium.How much should you charge to fill a balloon full of helium with a radius of 9 inches?

Answer 1

It's a rule of three problem, we have this:

`(1.50)/(4)=(x)/(9)`

We need to clear x:

`x=(1.50)/(4)\cdot9=(13.5)/(4)=3.375`

You should charge $3.375 to fill a balloon full of helium with a radius of 9 inches.