Question

If there are 10 fish 3 drown 2 die 4 swim away how many are left

Answer 1

First of all, fish can't drown.
Second, even if they die, they're still there.
Third, if they are in a concealed tank, they can't swim away.

In conclusion,
All the fish are left, it doesn't specify dead or alive fish.

Great riddle though!