SOLUTION: Barry bought 25 stamps of 5c and 20c. If the total value of the stamps is $4.40 how many stamps of each kind did he buy.

Question 990533: Barry bought 25 stamps of 5c and 20c. If the total value of the stamps is $4.40 how many stamps of each kind did he buy.
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
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F=number of 5c stamps; T=number of 20c stamps
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F+T=25
T=25-F
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5F+20T=440
5F+20(25-F)=440
5F+500-20F=440
-15F=-60
F=4
ANSWER: He bought four 5c stamps.
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T=25-F=25-4=21
ANSWER 2: He bought twenty one 20c stamps.
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CHECK:
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5F+20T=440
5(4)+20(21)=440
20+420=440
440=440

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