document.write( "Question 236817: There is a two digit number that is 9 times the sum of its digits.
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document.write( "What is this number? \n" );
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Algebra.Com's Answer #174208 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! There is a two digit number that is 9 times the sum of its digits.\r \n" ); document.write( "\n" ); document.write( "What is this number? \n" ); document.write( ": \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 \n" ); document.write( ": \n" ); document.write( "81 is the two digit number \n" ); document.write( ": \n" ); document.write( "Check: \n" ); document.write( "81 = 9(1+8) \n" ); document.write( "81 = 9(9) \n" ); document.write( " |