document.write( "Question 621995: a father is 60 years old and son is half his age how old was the boy when the son was four times his age?
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Algebra.Com's Answer #391068 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "a father is 60 years old and son is half his age or 
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document.write( "how old was the boy when ( years ago) the  was four times his age?
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document.write( "  4(30 -x) =  60-x
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document.write( "    60 = 3x
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document.write( "   x = 20, number of years ago.  Son was 10 at that time. (and the father 40) \n" );
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