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31 August, 18:59

Charmaine purchased a prepaid phone card for $20. long distance calls cost 19 cents a minute using this card. charmaine used her card only once to make a long distance call. if the remaining credit on her card is $17.15, how many minutes did her call last?

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  1. 31 August, 19:07
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    Credit used = $20-$17.15=$2.85

    time spent = $2.85 / $0.19 = 15minutes

    note : 19cents = $0.19
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