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AleksAgata [21]
1 year ago
14

Lashonda purchased a prepaid phone card for $20. Long distance calls cost 8 cents a minute using this card. Lashonda used her ca

rd onlyonce to make a long distance call. If the remaining credit on her card is $17.12, how many minutes did her call last?
Mathematics
1 answer:
Gre4nikov [31]1 year ago
8 0

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 <em>x</em> is the number of minutes.

We solve the equation for <em>x</em>

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

Then, we divide by -0.08 the equation

\begin{gathered} \frac{-0.08x}{-0.08}=\frac{-2.88}{-0.08} \\ x=36 \end{gathered}<h2>Therefore, Lashonda's call last 36 minutes.</h2>

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