document.write( "Question 695864: A father is 20yrs older than his son. If the sum of their ages is 40yrs, how old is the son now? \n" ); document.write( "
Algebra.Com's Answer #428689 by ReadingBoosters(3246)\"\" \"About 
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f = s + 20
\n" ); document.write( "f + s = 40
\n" ); document.write( "...
\n" ); document.write( "Substitute the first equation into the second
\n" ); document.write( "s+20 + s = 40
\n" ); document.write( "Combine like terms
\n" ); document.write( "2s + 20 = 40
\n" ); document.write( "2s = 40 - 20
\n" ); document.write( "2s = 20
\n" ); document.write( "s = 10
\n" ); document.write( "f = s + 20 = 10 + 20 = 30
\n" ); document.write( "...
\n" ); document.write( "Father is 30, Son is 10\r
\n" ); document.write( "\n" ); document.write( "……………….
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