document.write( "Question 1181713: Toby is n years old and Adrian is d years younger than Toby.
\n" ); document.write( "Write down a formula for S where S years is the sum of their ages.
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Algebra.Com's Answer #811613 by mananth(16946)\"\" \"About 
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Toby is n years old and Adrian is d years younger than Toby.\r
\n" ); document.write( "\n" ); document.write( "toby ---n years
\n" ); document.write( "adrian's age = n-d\r
\n" ); document.write( "\n" ); document.write( "S = n +n-d\r
\n" ); document.write( "\n" ); document.write( "S= 2n-d
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