Mathematics, 03.07.2019 07:00, Dweath50

Bob purchased a prepaid phone card for $15. long distance calls cost 18 cents a minute using this card. bob used his card only once to make a long distance call. if the remaining credit on her card is $12.30, how many minutes did her call last?

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Bob purchased a prepaid phone card for $15. long distance calls cost 18 cents a minute using this ca...