Posted by hamza on Monday, November 23, 2009 at 7:07pm.
x has 3 digits. the tens digits is half the hundreds digits. the number is odd.the sum of the digits is 9

math  TeacherJim, Monday, November 23, 2009 at 7:13pm
Let the tens digit be x. Then the hundreds digit is 2x. The sum of these two digits is 3x, and that has to be less than 9, so x must be less than 3  that is, the tens digit must be 1 or 2.
So we might have:
42U or 21U
where U is the Units digit.
The digits add to 9, so it has to be
423 or 216
But we are told that the answer is odd, and only one of those is odd...

math  Jennifer, Wednesday, November 19, 2014 at 9:27am
x + 2x = 3x
solve this first
where 3x < 9
3/3 x < 9/3 divide
both sides by 3
1x < or = 3 plug in 3 into the equation.
3 + 3*2 = 3*3
3 + 6 = 9
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