Posted by Grace on Tuesday, October 13, 2009 at 10:50pm.
The number is not less than 20. The number is not greater than 40. The number is not divisble by 2, 3, or 7.THe number is not a prime number. THe sum of the number's digits is not 8.
What's the number?

Math  Anonymous, Tuesday, October 13, 2009 at 11:04pm
25
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