document.write( "Question 394039: John is 40 years older than his son. Ten years later, their combined ages will be 90 years. How old is John? \n" ); document.write( "
Algebra.Com's Answer #279621 by robertb(5830)\"\" \"About 
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s = age of son
\n" ); document.write( "s+40 = age of Jon
\n" ); document.write( "==>(s+10) + (s+40 + 10) = 90
\n" ); document.write( "==>2s + 60 = 90
\n" ); document.write( "==> 2s =30
\n" ); document.write( "==> s = 15, the age of the son, and
\n" ); document.write( "s + 40 = 55, the age of John.
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