SOLUTION: How do I set this up: For a long distance call, the telephone company charges .35 for each of the first three minutes and .15 for each additional minute. If the cost of a call wa

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Question 782199: How do I set this up: For a long distance call, the telephone company charges .35 for each of the first three minutes and .15 for each additional minute. If the cost of a call was $12.30, how many minutes did the call last?
Found 2 solutions by josmiceli, Alan3354:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
It went past the 1st 3 minutes so
you have to add $.35
In words:
( cost ) = ( cost for 1st 3 min ) + ( .15 x minutes after that )
Let +x+ = total minutes minus +3+ minutes
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+c+=+.35+%2B+.15x+
+12.3+=+.35+%2B+.15x+
+.15x+=+11.95+
+x+=+79.667+
Add in the 1st +3+ min
+x+%2B+3+=+82.667+
+82.667+-+60+=+22.667+ min
+.667%2A60+=+40+ sec
The call lasted 1 hour 22 minutes and 40 seconds

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
How do I set this up: For a long distance call, the telephone company charges .35 for each of the first three minutes and .15 for each additional minute. If the cost of a call was $12.30, how many minutes did the call last?
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Cost = 35 + 15*(t-3) = 1230, t in minutes