document.write( "Question 831954:  \"Penelope spent all but a nickel of her $10 allowance on chocolate and bubblegum. She bought a total of 4.5 pounds of candy with chocolate costing 3.50/pound and bubblegum costing .60/pound. How much chocolate and bubblegum did she buy?\"\r
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| Algebra.Com's Answer #501776 by josgarithmetic(39630)      You can put this solution on YOUR website! She spent $9.95 on the mixture of candy.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "c for pounds of chocolate \n" ); document.write( "b for pounds of bubblegum\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "c+b=4.5 accounting for pounds of the candy \n" ); document.write( "3.5c+0.6b=9.95 accounting for cost\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Modify the cost equation to have all whole numbers. \n" ); document.write( "35c+6b=99.5 ---------- NOT QUITE ALL WHOLE NUMBERS but still useful. This was multiplying left and right by 10.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "If you multiply the poundage equation by 6, it becomes 6c+6b=27.\r \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Now look at the way the system is: \n" ); document.write( "6c+6b=27 and 35c+6b=99.5 \n" ); document.write( "- \n" ); document.write( "Subtract the \"27\" equation from the \"99.5\" equation and this eliminates the 6b. You will easily get a value for c. This is the Elimination Method. \n" ); document.write( "- \n" ); document.write( "35c+6b-(6c+6b)=99.5-27 \n" ); document.write( "29c=72.5 \n" ); document.write( "c=2.5 pounds for the chocolate candy \n" ); document.write( "This means b=2.0 pounds of bubblegum \n" ); document.write( " |