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Lashonda purchased a prepaid phone card for $20. Long distance calls cost 8 cents a minute using this card. Lashonda used her card onlyonce to make a long distance call. If the remaining credit on her card is $17.12, how many minutes did her call last?

User Jolivier
by
7.6k points

1 Answer

4 votes

We know that

• Lashonda purchased a prepaid phone card for $20.

,

• Long-distance calls cost 8 cents a minute.

,

• The remaining credit on her card is $17.12.

This problem can be expressed as


20-0.08x=17.12

Where x is the number of minutes.

We solve the equation for x


\begin{gathered} -0.08x=17.12-20 \\ -0.08x=-2.88 \end{gathered}

Then, we divide by -0.08 the equation


\begin{gathered} (-0.08x)/(-0.08)=(-2.88)/(-0.08) \\ x=36 \end{gathered}

Therefore, Lashonda's call last 36 minutes.

User Arjen
by
9.3k points
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