madmacc5303 madmacc5303

15-09-2020
Mathematics

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Martina purchased a prepaid phone card for $20. Long distance calls cost 21 cents a minute using this card. Martina used her card only once to make a long distance call. If the remaining credit on her card is $11.39, how many minutes did her call last?

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theexlas theexlas

15-09-2020

41 minutes.
20 - 11.39 = 8.61
861 cents.
861 / 21 = 41

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