document.write( "Question 31500This question is from textbook Elementary Algebra
\n" ); document.write( ": One number is three less than another. Their sum is fifteen. Find the numbers
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Algebra.Com's Answer #18167 by mbarugel(146)\"\" \"About 
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\n" ); document.write( "Let's call X and Y to your numbers.\r
\n" ); document.write( "\n" ); document.write( "We know that one number is three less than another. This means that \"X+=+Y+-+3\"\r
\n" ); document.write( "\n" ); document.write( "We also know that their sum is 15, so \"X+%2B+Y+=+15\"\r
\n" ); document.write( "\n" ); document.write( "Since we know that X = Y - 3, we use this in the \"sum\" equation to get:\r
\n" ); document.write( "\n" ); document.write( "\"X+%2B+Y+=+%28Y+-+3%29+%2B+Y+=+15\"
\n" ); document.write( "\"2Y+-+3+=+15\"
\n" ); document.write( "\"2Y+=+18\"
\n" ); document.write( "\"Y+=+9\"\r
\n" ); document.write( "\n" ); document.write( "So one of the numbers is 9. Since they must add to 15, then the other number must be 6.\r
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\n" ); document.write( "\n" ); document.write( "I hope this helps!
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