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8 August, 08:20

Debra purchased a prepaid phone card for $25. Long distance calls cost 19 cents a minute using this card. Debra used her card only once to make a long distance call. If the remaining credit on her card is $21.58, how many minutes did her call last?

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  1. 8 August, 10:01
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    25 - 0.19x = 21.58

    25 - 21.58 = 0.19x

    3.42 = 0.19x

    3.42/0.19 = x

    18 = x ... call lasted 18 minutes
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