SOLUTION: Yoko purchased a prepaid phone card for $30. Long distance calls cost 9 cents a minute using this card. Yoko used her card only once to make a long distance call. If the remaining

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Question 307732: Yoko purchased a prepaid phone card for $30. Long distance calls cost 9 cents a minute using this card. Yoko used her card only once to make a long distance call. If the remaining credit on her card is $27.93, how many minutes did her call last?
Found 2 solutions by rfer, unlockmath:
Answer by rfer(12726) About Me  (Show Source):
You can put this solution on YOUR website!
30-27.93=2.07
2.07/.09=23 min

Answer by unlockmath(1614) About Me  (Show Source):
You can put this solution on YOUR website!
Hello,
We can set up an equation using x to show minutes.
30-.09x=27.93 Subtract 30 to both sides to get:
-.09x=-2.07 Divide both sides by -.09 to get:
x= 23 minutes
There we go.
Make sense?
RJ
www.math-unlock.com