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OpenStudy (alli6106):
Yolanda purchased a prepaid phone card for $15 . Long distance calls cost 7 cents a minute using this card. Yolanda used her card only once to make a long distance call. If the remaining credit on her card is $12.13 , how many minutes did her call last?
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OpenStudy (anonymous):
$15 - $12.13 =$2.87. So if each minute was 7 cents, divide $2.87 by .07.
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