document.write( "Question 1166410: The tens digit of a certain two digit number eceeds the unitsdi git by 4 and is 1 less than twice the ones digit. Find the number. \n" ); document.write( "

Algebra.Com's Answer #790924 by ikleyn(52847) $\"\"$ $\"About$

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document.write( "Let t be the tens digit and u be the ones digit.\r\n" );
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document.write( "Then from the condition, we have two independent equations\r\n" );
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document.write( "    t - u = 4    (1)\r\n" );
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document.write( "    t = 2u - 1   (2)\r\n" );
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document.write( "Substitute t from (2) into (1).  You will get\r\n" );
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document.write( "    (2u-1) - u = 4,   or\r\n" );
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document.write( "     u         = 5.\r\n" );
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document.write( "Then from equation (2),  t = 2*5-1 = 9.\r\n" );
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document.write( "ANSWER.  The number is  95.\r\n" );
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