The questions are too easy for some people to answer! And you, can you answer them?

1_ Have 3 apples on the table, you took 2, now, how many apples are you having? ----- 2_ A family have parents, 6 sons and each son have 1 younger sister, how many people are there in that family? ----- 3_ A subway is going to the west when having south wind, which direction will the smoke go to? ----- 4_ How to destroy a tree without disturb the birds on that tree?