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

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

Below rebus represent famous DiCaprio movie. Can you name it?

Count the number of squares in the picture below.

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title