SOLUTION: Another word problem...help! Allen bought 30 stamps at the post office in 39 cent and 24 cent denominations. If the total cost of the stamps was $9.90, how many 39 cent stamps d

Question 53269: Another word problem...help!
Allen bought 30 stamps at the post office in 39 cent and 24 cent denominations. If the total cost of the stamps was $9.90, how many 39 cent stamps did Allen buy?
Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!
number of 39 cent stamps = x
number of 24 cent stamps = y
which can look like:
and

plug:

There are 18 0.39 cent stamps and 12 0.24 cent stamps.
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