So I was given this puzzle quite some time ago and just thought it would make a nice addition to this site:
Your task is to determine the method how the result is determined from the given number. A few example cases include:
177383 -> 2
267453 -> 2
111111 -> 0
636240 -> 4
367183 -> 3
247123 -> 1
369108 -> 5
To those, who hit a brick wall, here is a tip: This puzzle is easiest for young children and gets harder the older you get... Happy guessing ;)
Answer
The number is the number of "holes" in the written decimal representation of the number.
More specifically, each digit contributes this much to the total number:
0: 1
1: 0
2: 0
3: 0
4: 0 or 1, depending on how you draw them
5: 0
6: 1
7: 0
8: 2
9: 1
In your case above, 4 is drawn with a hole, so it contributes 1.
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