So, my brother works at the Dutch Navy and his teacher gave his class this riddle. Nobody figured it out, so he shared it with me. I actually didn't got it either, but now I know how so I thought; why not share it with you guys :D
Well this sucks XD There are a few mistakes. I'ma put the whole corrected list down here
0=4=4
1=3=4
2=3=4
3=4
4=4
5=4
6=3=4
7=5=4
8=5=4
9=4
10=3=4
11=6=3=4
101=13=8=4
12=5=4
100=7=5=4
1000=8=5=4
2000=11=6=3=4
25=10=3=4
32=9=4
I won't post the answer on here....but you can see what it is here:
http://www.frihost.com/forums/vt-88779.html