Question

Kaitlin purchased a prepaid phone card for $15. Long distance calls cost 16 cents a minute using this card. Kaitlin used her card only once to make a longdistance call. If the remaining credit on her card is $9.88, how many minutes did her call last?

Answer 1

`15-0.16x=9.88`

where x is the minutes

we can solve x

`\begin{gathered} -0.16x=9.88-15 \\ -0.16x=-5.12 \\ 0.16x=5.12 \\ x=(5.12)/(0.16) \\ x=32 \end{gathered}`

so your call lasted 32 minutes