Roy: There are 5 fishes in a pond. 3 died. How many are left?

Joyce: 5-3=2 !Of course 2 fishes!

Roy:No! It’s 5 because no one take them out of the pond.ok? Next question, if all the fishes died, how many are left now?

Joyce: 5! It must be correct!

Roy: Wrong! It’s zero because all the fishes decayed! haha!

Joyce:Now it’s my turn to ask u. If there are 5 birds on a tree, a hunter gives out a shot,but it do not kill any bird, how many are left now?

Roy: Zero! Because all the birds fly away after they hear the shot.

Joyce: No!It’s 5 because all the birds are deaf !Haha! Again, 3 birds flies to the tree again. The hunter shoots 8 birds down.How many birds are left?

Roy: Of course is zero. All died.

Joyce: Wrong ! You are wrong! It’s one because your bird are still alive!!Haha