Question

isabel purchased a prepaid phone card for $20. long distance calls cost 7 cents a minute using this card. isabel used her card only once to make a distance call. if the remaining credit on her card is $17.13 how many minutes did her call last?

Answer 1

20 - .07c = 17.13
20 - 17.13 = 2.87
2.87/7 = 41

Her call took 41 minutes