SOLUTION: Post card stamps are $.20 each. While letter stamps cost $.33 each. If you have 50 stamps worth $12.60, how many of each type do you have?

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Question 357931: Post card stamps are $.20 each. While letter stamps cost $.33 each. If you have 50 stamps worth $12.60, how many of each type do you have?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Post card stamps are $.20 each. While letter stamps cost $.33 each. If you have 50 stamps worth $12.60, how many of each type do you have?
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Let the number of post card stamps be "c".
The cost of c of these stamps is 20c cents.
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Let the number of letter stamps be "s"
The cost of s of these stamps is 33s cents.
Equations:
Quantity Eq.::: c + s = 50 stamps
Value Eq:::::: 20c+33s = 1260 cents
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Set up the equations for elimination.
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Multiply thru the 1st equation by 20 to get:
20c + 20s = 20*50
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Subtract that from the Value Eq. and solve for "s":
13s = 260
s = 20 (# of letter stamps)
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Since c+s = 50, c = 30 (# of post card stamps.
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Cheers,
Stan H.