document.write( "Question 1164690: 4. Marilyn is 3 years younger than her friend Rosie. In 7 years, the product of their ages will be thrice the product of their ages 5 years ago. How old are they at present?
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Algebra.Com's Answer #789122 by josgarithmetic(39618) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"system%28m=r-3%2C%28m%2B7%29%28r%2B7%29=3%28m-5%29%28r-5%29%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "Substitute for m, first.
\n" ); document.write( " $\"%28r-3%2B7%29%28r%2B7%29=3%28r-3-5%29%28r-5%29\"$
\n" ); document.write( " $\"%28r%2B4%29%28r%2B7%29=3%28r-8%29%28r-5%29\"$
\n" ); document.write( " $\"r%5E2%2B11r%2B28=3%28r%5E2-13r%2B40%29\"$
\n" ); document.write( " $\"r%5E2%2B11r%2B28=3r%5E2-39r%2B120\"$
\n" ); document.write( " $\"3r%5E2-r%5E2-39r-11r%2B120-28=0\"$
\n" ); document.write( " $\"2r%5E2-50r%2B92=0\"$
\n" ); document.write( " $\"r%5E2-25r%2B46=0\"$
\n" ); document.write( "Factorable.
\n" ); document.write( " $\"%28r-23%29%28r-2%29=0\"$ \r
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\n" ); document.write( "\n" ); document.write( "Most likely $\"highlight%28r=23%29\"$ and $\"highlight%28m=20%29\"$ . \n" ); document.write( "

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