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Logic problems. The solution to these problems does not usually require a lot of math, but will take some thinking until you find the right approach.
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The smallest cardinal number whose name is spelled with:

3 letters is 1 (one)
4 letters is 0 (zero)
5 letters is 3 (three)
6 letters is (?)
7 letters is (?)
8 letters is (?)
9 letters is (?)
10 letters is (?)
15 letters is 103 (one hundred three *)
20 letters is (?)
25 letters is (?)
30 letters is (?)
40 letters is (?)
50 letters is (?)
100 letters is (?)

In the above list replace all interrogation marks by a correct answer.

* Note the absence of the word "and".

(No Solution Yet, 4 Comments) Submitted on 2016-09-23 by Ady TZIDON   
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