document.write( "Question 59811This question is from textbook Alegbra Concepts and Applications
\n" ); document.write( ": I cannot figrue out this word problem help please!!\r
\n" ); document.write( "\n" ); document.write( "Mr. Adams buys a bag or apples and a bag of pears for a total of $14. There are eight pounds of fruit in all. The apples cost $1.50 per pound, and the pears cost $2.30 per pound. How many pounds of pears did he buy??
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Algebra.Com's Answer #41063 by joyofmath(189)\"\" \"About 
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Let \"w%5Ba%5D\" = weight of apples.
\n" ); document.write( "Let \"w%5Bp%5D\" = weight of pears.
\n" ); document.write( "Let \"c%5Ba%5D\" = cost per pound of apples.
\n" ); document.write( "Let \"c%5Bp%5D\" = cost per pount of pears.\r
\n" ); document.write( "\n" ); document.write( "(1) Then \"w%5Ba%5D%2Bw%5Bp%5D=8\" because Mr. Adams bought 8 pounds of fruit.
\n" ); document.write( "(2) Also \"c%5Ba%5D%2Aw%5Ba%5D%2Bc%5Bp%5D%2Aw%5Bp%5D=14\" because the fruit cost $14.
\n" ); document.write( "(3) \"c%5Ba%5D=1.5\" because apples cost $1.50 per pound.
\n" ); document.write( "(4) \"c%5Bp%5D=2.3\" because pears cost $2.30 per pound.\r
\n" ); document.write( "\n" ); document.write( "In (1) we substract \"w%5Ba%5D\" from both sides of the equation and get \"w%5Bp%5D=8-w%5Ba%5D\"
\n" ); document.write( "In (2) we replace \"c%5Ba%5D\" and \"c%5Bp%5D\" with 1.5 and 2.3 respectively. We then get:
\n" ); document.write( " \"1.5%2Aw%5Ba%5D%2B2.3%2Aw%5Bp%5D=14\"
\n" ); document.write( "But, we know that \"w%5Bp%5D=8-w%5Ba%5D\" so we know that \"1.5%2Aw%5Ba%5D%2B2.3%2A%288-w%5Ba%5D%29=14\"
\n" ); document.write( "which expands to \"1.5%2Aw%5Ba%5D%2B2.3%2A8-2.3%2Aw%5Ba%5D=14\"
\n" ); document.write( "which is equivalent to \"1.5%2Aw%5Ba%5D%2B18.4-2.3%2Aw%5Ba%5D=14\"
\n" ); document.write( "which is equivalent to \"-.8%2Aw%5Ba%5D%2B18.4=14\"
\n" ); document.write( "which is equivalent to \"-.8%2Aw%5Ba%5D=-4.4\"
\n" ); document.write( "Divide both sides by \"-.8\" and we get \"w%5Ba%5D=5.5\"\r
\n" ); document.write( "\n" ); document.write( "So, Mr. Adams bought 5.5 bags of apples.
\n" ); document.write( "He bought 8 pounds of fruit in total so he bought 2.5 pounds of pears, which is the answer to the question.\r
\n" ); document.write( "\n" ); document.write( "To verify the answer:\r
\n" ); document.write( "\n" ); document.write( "If \"w%5Ba%5D=5.5\" and \"w%5Bp%5D=2.5\"
\n" ); document.write( "Then, from (2) above \"c%5Ba%5D%2Aw%5Ba%5D%2Bc%5Bp%5D%2Aw%5Bp%5D=14\"
\n" ); document.write( "Or, \"1.5%2A5.5%2B2.3%2A2.5\" should equal 14
\n" ); document.write( "\"1.5%2A5.5=8.25\" and \"2.3%2A2.5=5.75\"
\n" ); document.write( "and, indeed, 8.25+5.75=14
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