Question 386717: Jack bought $8 worth of 6-cent and 8-cent stamps numbering 110 stamps in all. How many stamps of each kind did he buy?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Jack bought $8 worth of 6-cent and 8-cent stamps numbering 110 stamps in all. How many stamps of each kind did he buy?
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Equations:
Quantity: s + e = 110
Value 6s + 8e = 800 cents
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Multiply thru the Quantity Eq by 6
6s + 6e = 6*110
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Subtract that from the Value Eq and solve for "e":
2e = 140
e = 70 (# of eight cent stamps)
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Since s + e = 110, s = 110-70, s = 40 (# of 6 cent stamps)
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Cheers,
Stan H.
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