document.write( "Question 836664: travis is seven years younger than his sister if you take double the sum of both their ages they are 36 \n" ); document.write( "
Algebra.Com's Answer #504317 by ankor@dixie-net.com(22740)\"\" \"About 
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travis is seven years younger than his sister
\n" ); document.write( "t = s - 7
\n" ); document.write( " if you take double the sum of both their ages, they are 36
\n" ); document.write( "2(t + s) = 36
\n" ); document.write( "simplify, divide by 2
\n" ); document.write( "t + s = 18
\n" ); document.write( "replace t with (s-7)
\n" ); document.write( "s - 7 + s = 18
\n" ); document.write( "s + s = 18 + 7
\n" ); document.write( "2s = 25
\n" ); document.write( "s = 25/2
\n" ); document.write( "s = 12.5 is the sisters age
\n" ); document.write( "then
\n" ); document.write( "5.5 = t's age
\n" ); document.write( ";
\n" ); document.write( ":
\n" ); document.write( "See if that checks out.
\n" ); document.write( "2(5.5 + 12.5) = 36
\n" ); document.write( " \n" ); document.write( "
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