document.write( "Question 887657: a number lies between 10 & 100. the number is 8 times the sum of its digits & when 45 is subtracted from the number the digits are reversed. what is the number? \n" ); document.write( "
Algebra.Com's Answer #536785 by josgarithmetic(39618)\"\" \"About 
You can put this solution on YOUR website!
U and T, the digits for UNITS and TENS.
\n" ); document.write( "The number is some variable \"10%2AT%2BU\". I am only guessing that the number is not 100.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Eight times the sum of its digits:
\n" ); document.write( "\"8%28U%2BT%29=U%2B10T\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "when 45 is subtracted from the number the digits are reversed:
\n" ); document.write( "\"U%2B10T-45=10U%2BT\", think about this one carefully.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Simplify each equation.
\n" ); document.write( "-
\n" ); document.write( "\"8U%2B8T=U%2B10T\"
\n" ); document.write( "\"7U=2T\", not seem right.
\n" ); document.write( "-
\n" ); document.write( "\"U-10U%2B10T-45=T\"
\n" ); document.write( "\"-9U%2B10T-T=45\"
\n" ); document.write( "\"-9U%2B9T=45\"
\n" ); document.write( "\"-U%2BT=5\"
\n" ); document.write( "\"T=U%2B5\"
\n" ); document.write( "-
\n" ); document.write( "Try substituting for T in the first simplified equation.
\n" ); document.write( "\"7U=2T\"
\n" ); document.write( "\"7U=2%28U%2B5%29\"
\n" ); document.write( "\"7U=2U%2B10\"
\n" ); document.write( "\"5U=10\"
\n" ); document.write( "\"highlight%28U=2%29\"
\n" ); document.write( "-
\n" ); document.write( "Again using 7U=2T, what is T?
\n" ); document.write( "\"7%2A2=2T\"
\n" ); document.write( "\"14=2T\"
\n" ); document.write( "\"highlight%28T=7%29\"
\n" ); document.write( "-
\n" ); document.write( "-
\n" ); document.write( "The number is \"highlight%28highlight%2872%29%29\".
\n" ); document.write( "
\n" );