Pre algebra using the equation ax+b=c to solve

Algebra
Tutor: None Selected Time limit: 1 Day

Salma purchased a prepaid phone card for 
.
 Long distance calls cost 
 cents a minute using this card. Salma used her card only once to make a long distance call. If the remaining credit on her card is 
, how many minutes did her call last?
Aug 1st, 2015

Thank you for the opportunity to help you with your question!

Total prepaid balance available = $15

Remaining credit = $8.7

Amount used up in the call = 15-8.7 = $6.3 = 630 cents

Time taken to make the call = 630/14 = 45 minutes.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 1st, 2015

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