Mathematics, 11.07.2019 17:30, mutoni55
Mary purchased a prepaid phone card for $30 . long distance calls cost 22 cents a minute using this card. mary used her card only once to make a long distance call. if the remaining credit on her card is $21.42 , how many minutes did her call last?
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Mary purchased a prepaid phone card for $30 . long distance calls cost 22 cents a minute using this...
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