SOLUTION: Julie went to the post office and bought both $0.49 stamps and $0.34 postcards for her office's bills. She spent $75.80. The number of stamps was 20 more than twice the number of p
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Question 1080447: Julie went to the post office and bought both $0.49 stamps and $0.34 postcards for her office's bills. She spent $75.80. The number of stamps was 20 more than twice the number of postcards. How many of each did she buy Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Julie went to the post office and bought both $0.49 stamps and $0.34 postcards for her office's bills. She spent $75.80. The number of stamps was 20 more than twice the number of postcards. How many of each did she buy
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Equations:
s = 2p + 20
0.49s + 0.34p = 75.80
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49s - 98p = 49*20
49s + 34p = 7580
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Subtract and solve for "p"::
132p = 6600
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p = 50 (# of postcards)
s = 2p+20 = 120 (# of stamps)
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Cheers,
Stan H.
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