Question

Charmaine purchased a prepaid phone card for $20 . long distance calls cost 19 cents a minute using this card. charmaine used her card only once to make a long distance call. if the remaining credit on her card is $17.15 , how many minutes did her call last?

Answer 1

credit used = $20-$17.15=$2.85
time spent = $2.85 / $0.19 = 15minutes
note : 19cents = $0.19