Question

For his long distance phone service, Keith pays a $3 monthly fee plus 11 cents per minute. Last month, Keith's long distance bill was $16.42. For how many minutes was Keith billed?

Answer 1

We have the following:

With the statement we get the following equation:

$t=3+0.11x$

where x is the number of minutes and t is the total value of the long distance phone service

$\begin{gathered} 16.42=3+0.11x \\ 0.11x=16.42-3 \\ x=\frac{13.42}{0.11} \\ x=122 \end{gathered}$

Which means you spent a total of 122 minutes