document.write( "Question 272321: 4 years ago fred is twice as old as mark, 4 years from now mark is 3/4 of fred's age, how old is fred now? \n" ); document.write( "

Algebra.Com's Answer #217700 by JBarnum(2146) $\"\"$ $\"About$

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Fred, Mark
\n" ); document.write( " $\"%28F-4%29=2%28M-4%29\"$
\n" ); document.write( " $\"F-4=2M-8%29\"$
\n" ); document.write( " $\"F%2B4=2M\"$
\n" ); document.write( " $\"%281%2F2%29F%2B2=M\"$
\n" ); document.write( " $\"%283%2F4%29%28F%2B4%29=%28M%2B4%29\"$
\n" ); document.write( " $\"%283%2F4%29F%2B3=M%2B4\"$
\n" ); document.write( " $\"%283%2F4%29F-1=M\"$
\n" ); document.write( " $\"%283%2F4%29F-1=%281%2F2%29F%2B2\"$
\n" ); document.write( " $\"%283%2F4%29F-1=%282%2F4%29F%2B2\"$
\n" ); document.write( " $\"%281%2F4%29F-1=2\"$
\n" ); document.write( " $\"%281%2F4%29F=3\"$
\n" ); document.write( " $\"F=12\"$
\n" ); document.write( " $\"M=8\"$ \n" ); document.write( "

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