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Mathematics, 29.09.2019 02:20 nbnb8831

Lena purchased a prepaid phone card for $20. long distance calls cost 21 cents a minute using this card, lena used her card only once to make a long distance
call. if the remaining credit on her card is $12.23, how many minutes did her call last?

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Lena purchased a prepaid phone card for $20. long distance calls cost 21 cents a minute using this c...
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