Question

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.

Answer 1

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

`25-17.02=7.98`

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:

`(7.98)/(0.19)=42`

therefore, Teresa called for 42 minutes.