SOLUTION: Mr. Lowe bought some three cent stamps and some two cent stamps. The total cost was $8.90. How many stamps of each kind did he buy if the total number was 345 stamps?

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Question 362943: Mr. Lowe bought some three cent stamps and some two cent stamps. The total cost was $8.90. How many stamps of each kind did he buy if the total number was 345 stamps?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y=345 OR X=345-Y
.02X+.03Y=8.90
.02(345-Y)+.03Y=8.90
6.90-.02Y+.03Y=8.90
.01Y=8.90-6.90
.01Y=2
Y=2/.01
Y=200 3 CENT STAMPS WERE BOUGHT.
345-200=145 2 CENT STAMPS WERE BOUGHT.
PROOF:
,02*145+.03*200=8.90.
2.90+6.00=8.890
8.90=8.90