Question

Ashley purchased a prepaid phone card for $20, Long distance calls cost 18 cents a minute using this card. Ashley used her card only once to make a long distance call. If the remaining credit on her card is $17.66.How many minutes did her call last?

Answer 1

Ashley purchased a prepaid phone card for $20

Long-distance calls cost 18 cents a minute using this card.

If the remaining credit on her card is $17.66.

How many minutes did her call last?

Let x denotes the number of minutes

Then we can set up the following equation

$\ 20-0.18x=\ 17.66$

She initially had $20 credit, so we can need to subtract the credit that she used (that is 0.18x) from the initial credit and the result must be equal to the remaining credit that is $17.66.

Let us solve the above equation for x

$\begin{gathered} \ 20-0.18x=\ 17.66 \\ -0.18x=\ 17.66-\ 20 \\ -0.18x=-\ 2.34 \\ x=\frac{-\ 2.34}{-0.18} \\ x=13 \end{gathered}$

Therefore, the number of minutes is 13

Her call last for 13 minutes.