SOLUTION: Mary purchased a prepaid phone card for $20 . Long distance calls cost 18 cents a minute using this card. Mary used her card only once to make a long distance call. If the r

Question 1089905: Mary purchased a prepaid phone card for
$20
. Long distance calls cost
18
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
$11.18
, how many minutes did her call last?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

She used $8.82 on her card
---------------------------
Let = number of minutes she used

The call lasted 49 min

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