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Teresa purchased a prepaid phone card for $25. Long distance calls cost 19 cents a minute using this card. Teresa used her card only once to make a long distance call. If the remaining credit on her card is $17.02, how many minutes did her call last?Please help me. Its due in a couple of hours.

Respuesta :

We have that the prepaid phone card has $25 but Teresa used it and then it has $17.02, then the difference is:

[tex]25-17.02=7.98[/tex]

this means that Teresa spent $7.98 on her call, then, if one minute costs 19 cents (or $0.19), then, dividing 7.98 by 0.19 we have:

[tex]\frac{7.98}{0.19}=42[/tex]

therefore, Teresa called for 42 minutes.