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Lashonda purchased a prepaid phone card for $20. Long distance calls cost 12 cents a minute using this card. Lashonda used her card only once to make a long distance call. If the remaining credit on her card is $17, how many minutes did her call last?

1 Answer

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Given that the long distance calls cost 12 cents (i.e. $0.12) per minute.

Let Lashonda spent 'x' minutes on the call,

Then the associated cost is given by,


\begin{gathered} C=\text{Cost per minute}*\text{ No. of minutes} \\ C=0.12* x \\ C=0.12x \end{gathered}

Given that the total cost initially was $20, and the cost remaining after making the call is $17,


\begin{gathered} \text{Total Cost=Cost Spent on Call+Remaining Cost on Card} \\ 20=0.12x+17 \\ 0.12x=20-17 \\ 0.12x=3 \\ x=(3)/(0.12) \\ x=25 \end{gathered}

Thus, her call lasted for 25 minutes.

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