Question

Tiffany's phone company charges eight cents per minute of talk time plus a monthly service fee of $5.95. If her phone bill last month was $17.15, how many minutes did she talk on the phone?

Answer 1

We can translate this question as follows:

`0.08x+5.95=17.15`

Then, we need to solve the equation for x (number of minutes):

`0.08x=17.15-5.95\Rightarrow0.08x=11.2\Rightarrow x=(11.2)/(0.08)\Rightarrow x=140`

Therefore, Tiffany talked on the phone for 140 minutes.