document.write( "Question 236817: There is a two digit number that is 9 times the sum of its digits.
\n" ); document.write( "What is this number?
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Algebra.Com's Answer #174208 by ankor@dixie-net.com(22740)\"\" \"About 
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There is a two digit number that is 9 times the sum of its digits.\r
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\n" ); document.write( "A simple equation
\n" ); document.write( "10x + y = 9(x + y)
\n" ); document.write( "10x + y = 9x + 9y
\n" ); document.write( "10x - 9x = 9y - y
\n" ); document.write( "x = 8y
\n" ); document.write( "Obviously, y has to = 1, for x to equal a value less than 10
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\n" ); document.write( "81 is the two digit number
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\n" ); document.write( "Check:
\n" ); document.write( "81 = 9(1+8)
\n" ); document.write( "81 = 9(9)
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