document.write( "Question 611963: a man is 4 times old his son and their ages add up to 40 years. What was the age of son 5 years ago? \n" ); document.write( "
Algebra.Com's Answer #385217 by richwmiller(17219)\"\" \"About 
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4x+x=40
\n" ); document.write( "5x=40
\n" ); document.write( "x=8
\n" ); document.write( "x-5=3
\n" ); document.write( "The son was 3 years old five years ago
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