winterblanco
01.08.2019 •
Mathematics
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?
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Ответ:
time spent = $2.85 / $0.19 = 15minutes
note : 19cents = $0.19
Ответ: