In episode 11 of .hack//SIGN, Tsukasa, Mimiru, and Bear went to the last statue to answer its question. The question was "In a world where 1 is 2, 5 is 5, and 8 is 7, what thing appears when you multiply 331 x 3 without Heaven or Earth?"
Mimiru comments that she was terrible at math, and Tsukasa said "Multiplying 331 by 3 is 933", but it was supposed to be 993. Guess he's not too good at math either.
This is what the English dub said, I'm not sure about the original Japanese one. And in case you were wondering, the answer to the question is "egg".