SOLUTION: [ A baker purchased 12 lb of wheat flour and 15 lb of rye flour for a total cost of $39.87. A second purchase of, at the same prices, included 15 lb of wheat flour and 10 lb of rye

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Question 816135: [ A baker purchased 12 lb of wheat flour and 15 lb of rye flour for a total cost of $39.87. A second purchase of, at the same prices, included 15 lb of wheat flour and 10 lb of rye flour. The cost of the second purchase was $33.30. Find the [] cost per pound of the wheat and rye flours. ]
Answer by TimothyLamb(4379) About Me  (Show Source):
You can put this solution on YOUR website!
12w + 15r = 3987
15w + 10r = 3330
r = (3330 - 15w)/10
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12w + 15r = 3987
12w + 15((3330 - 15w)/10) = 3987
12w + (15/10)(3330 - 15w) = 3987
12w + 4995 - 22.5w = 3987
10.5w = 1008
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w = 96 cents
r = 189 cents
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Answer:
w = $0.96 / lb
r = $1.89 / lb
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