Required Mathematical Intelligence

Chapter 16 Fishing
There is a man who likes fishing.One day when he came back from fishing, someone on the road asked him how many fish he had caught. He replied: "There are 6 fish without heads, 9 fish without tails, and 8 half-cut fish." Do you know how many fish he caught?

[Answer: "6" has gone to the "head", "9" has gone to the "tail" and it is all "0", and "8" is truncated from it to two "0", so none of them were caught. ]
(End of this chapter)