SOLUTION: Allen bought 20 stamps at the post in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cents did Allen buy?

Question 115170: Allen bought 20 stamps at the post in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cents did Allen buy?
Answer by elima(1433) (Show Source): You can put this solution on YOUR website!
Allen bought 20 stamps at the post in 37 cents and 20 cents denominations. If the total cost of the stamps was $7.06, how many 37 cents did Allen buy?
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x+y=20
.37x+.20y=7.06
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y=20-x
.37x+.20(20-x)=7.06
.37x+4-.20x=7.06
.37x-.2x=7.06-4
.17x=3.06
x=18
18+y=20
y=20-18
y=2
Allen bought 18 37 cent stamps
:)
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