document.write( "Question 710037: The sum of the digits of a 2 digit number is 6. The second digit is twice the first digit. Find the 2 digit number \n" ); document.write( "

Algebra.Com's Answer #436857 by Edwin McCravy(20060) $\"\"$ $\"About$

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document.write( "If you are in the lower grades:\r\n" );
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document.write( "The sum of the digits of a 2 digit number is 6. \r\n" );
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document.write( "So it's either 15, 24, 33, 42, or 51.\r\n" );
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document.write( "The second digit is twice the first digit. \r\n" );
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document.write( "So it's 24.\r\n" );
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document.write( "If you are in the upper grades,\r\n" );
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document.write( "t = the tens digit\r\n" );
document.write( "u = the units digit\r\n" );
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document.write( "The system to solve is:\r\n" );
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document.write( "Substitute 2t for u in the first equation:\r\n" );
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document.write( "t+2t = 6\r\n" );
document.write( "  3t = 6\r\n" );
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document.write( "Divide both sides by 3\r\n" );
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document.write( "  = \r\n" );
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document.write( "  = \r\n" );
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document.write( "  = 2\r\n" );
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document.write( "u = 2t = 2(2) = 4\r\n" );
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document.write( "u = 4\r\n" );
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document.write( "The number = 24\r\n" );
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document.write( "Edwin

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