SOLUTION: Hi A post office sold twice as many 30 cent stamps as 60 cent. The number of 5 cent stamps was 6 more than the number of 60 cents stamps. If the value of the stamps was $8.85 how

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Question 1184902: Hi
A post office sold twice as many 30 cent stamps as 60 cent. The number of 5 cent stamps was 6 more than the number of 60 cents stamps. If the value of the stamps was $8.85 how many 5 cent stamps were sold.
Textbook solution was 9 my solution was 6.84 which does not make sense.
Thanks
Answer by greenestamps(13203) About Me  (Show Source):
You can put this solution on YOUR website!


Your answer is right -- so either the problem is faulty or you have copied the numbers wrong.

let x = # of 60-cent stamps
then 2x = # of 30-cent stamps
and x+6 = # of 5-cent stamps

The total value was $8.85 = 885 cents:

60%28x%29%2B30%282x%29%2B5%28x%2B6%29+=+885
60x%2B60x%2B5x%2B30+=+885
125x=855
x=855%2F125+=+6.84