document.write( "Question 805562: the age of a father is now 5 times the age of his son. After 18 years, the age of the father will be twice his son's age.
\n" ); document.write( "a). Let x and y be the present age of the father and his son respectively. Set up two equations connecting x and y.
\n" ); document.write( "b). Find their present ages.
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Algebra.Com's Answer #485306 by mananth(16946)\"\" \"About 
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x=5y
\n" ); document.write( "x-5y=0..................(1)\r
\n" ); document.write( "\n" ); document.write( "after 18 years
\n" ); document.write( "father's age = (x+18)
\n" ); document.write( "son's age (y+18)\r
\n" ); document.write( "\n" ); document.write( "(x+18)=2(y+18)\r
\n" ); document.write( "\n" ); document.write( "x+18=2y+36
\n" ); document.write( "x-2y=18...............(2)\r
\n" ); document.write( "\n" ); document.write( "subtract (2) from (1)\r
\n" ); document.write( "\n" ); document.write( "-3y=-18\r
\n" ); document.write( "\n" ); document.write( "y=6\r
\n" ); document.write( "\n" ); document.write( "father = 5x = 5*6=30 years
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