Replace the question mark with the correct number in below Picture:

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

Do You See It?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Riddle me this, Riddle me that,
What am I? I am made of wood, but you can't see me down?

There was a strange boy who was born before his father. How can this be possible?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

Solve the following series:
AZ, GT, MN, __, YB