document.write( "Question 391887: the sum of the digits of a two-digit number is one third of the number. The units digit is 5 more than the tens digit. What is the number? \n" ); document.write( "
Algebra.Com's Answer #278048 by richard1234(7193)\"\" \"About 
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Suppose the number is 10a + b, where a and b are digits. Then,\r
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\n" ); document.write( "\n" ); document.write( "\"a+%2B+b+=+%2810a+%2B+b%29%2F3\"\r
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\n" ); document.write( "\n" ); document.write( "\"b+=+a+%2B+5\". To make this an easy, single variable equation we replace all occurrences of b with a+5:\r
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\n" ); document.write( "\n" ); document.write( "\"a+%2B+%28a%2B5%29+=+%2810a+%2B+%28a%2B5%29%29%2F3+=+%2811a+%2B+5%29%2F3\"\r
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\n" ); document.write( "\n" ); document.write( "\"2a+%2B+5+=+%2811a+%2B+5%29%2F3\"\r
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\n" ); document.write( "\n" ); document.write( "\"6a+%2B+15+=+11a+%2B+5\"\r
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\n" ); document.write( "\n" ); document.write( "\"a+=+2\" \"b+=+7\"\r
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\n" ); document.write( "\n" ); document.write( "The number is 27.
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