Question

your cell phone carrier charges $0.18 for each extra minute over your limit.if the total shows that you owe $3.24 for extra minutes, how many minutes did you go over

Answer 1

If you have

`(1 \ min)/(0.18 \ dollars)`
as your cost,
and you paid

`3.24 \ dollars`,
then

`((1 \ min)/(0.18 \ dollars))(3.24 \ dollars)=18 \ min`.

Thankfully, most cellphone companies don't charge for minutes anymore!