document.write( "Question 574538: MR.Ben is 4 times older than his son.The sum of their sges is 45 years.Find the age of his son.
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Algebra.Com's Answer #369120 by chana(69)\"\" \"About 
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let son's age=x
\n" ); document.write( "so mr.ben age = 4x
\n" ); document.write( "The sum of their sges is 45 years
\n" ); document.write( "this implies
\n" ); document.write( "x + 4x = 45\r
\n" ); document.write( "\n" ); document.write( "so son's age , x=9
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