document.write( "Question 168256: Please help me solve this problem: \r
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document.write( "There is only one positive integer which is exactly twice the sum of its digits. Find this two digit number and show how you got your work. \n" );
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Algebra.Com's Answer #124027 by 303795(602)![]() ![]() ![]() You can put this solution on YOUR website! Trial and error sounds good (with a bit of extra thinking on the side) \n" ); document.write( "If the number is twice the sum of its digits then the number must be even. Lets try 12. \n" ); document.write( "12. 1 + 2 = 3 but 12 is not twice 3. \n" ); document.write( "Using that idea the numbers have to total at least 7 so double 7 would be 14. \n" ); document.write( "The two digit number with digits totalling 7 would be 16. \n" ); document.write( "16. 1 + 6 = 7 but 16 is not twice 7 but we are getting closer (next even number to try is 18) \n" ); document.write( "18. 1 + 8 = 9 and 18 is twice 9 \n" ); document.write( "So the number is 18. \n" ); document.write( " |