document.write( "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. ] \n" ); document.write( "

Algebra.Com's Answer #491383 by TimothyLamb(4379) $\"\"$ $\"About$

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12w + 15r = 3987
\n" ); document.write( "15w + 10r = 3330
\n" ); document.write( "r = (3330 - 15w)/10
\n" ); document.write( "---
\n" ); document.write( "12w + 15r = 3987
\n" ); document.write( "12w + 15((3330 - 15w)/10) = 3987
\n" ); document.write( "12w + (15/10)(3330 - 15w) = 3987
\n" ); document.write( "12w + 4995 - 22.5w = 3987
\n" ); document.write( "10.5w = 1008
\n" ); document.write( "---
\n" ); document.write( "w = 96 cents
\n" ); document.write( "r = 189 cents
\n" ); document.write( "---
\n" ); document.write( "Answer:
\n" ); document.write( "w = $0.96 / lb
\n" ); document.write( "r = $1.89 / lb
\n" ); document.write( "---
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