document.write( "Question 233319: I am an odd number. The sum of my digits is 10. I am less than forty. What numbers can i be? \n" ); document.write( "

Algebra.Com's Answer #172222 by stanbon(75887) $\"\"$ $\"About$

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I am an odd number. The sum of my digits is 10. I am less than forty. What numbers can I be?
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\n" ); document.write( "If less than forty it is a 2-digit number.
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\n" ); document.write( "Let the number be 10t+u where t is the tens digit and u is the units digit.
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\n" ); document.write( "Equations:
\n" ); document.write( "10t+u < 40
\n" ); document.write( "t+u = 10
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\n" ); document.write( "u = 10-t
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\n" ); document.write( "Substitute into 10t+u<40 and solve for \"t\":
\n" ); document.write( "10t+10-t < 40
\n" ); document.write( "9t < 30
\n" ); document.write( "t < 30/9 = 3 1/3
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\n" ); document.write( "t is 1,2,or 3
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\n" ); document.write( "If t is 1, u = 9 giving you the number 19
\n" ); document.write( "If t is 2, u = 8 giving you the number 28
\n" ); document.write( "If t is 3, u = 7 giviing you the number 37
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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