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Mary purchased a prepaid phone card for $30 . Long distance calls cost 22 cents a minute using this card. Mary used her card only once to make a long distance call. If the remaining credit on her card is $21.42 , how many minutes did her call last?

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blakemortensen1
so it will be 30-21.42 to find the cost of the call
This is 8.58
Then dived 8.52 by .22 This equals 39. Your answer is 39. 

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