I make two people out of one. What am I?

Solve the mathematical equation in the picture below.

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Can you solve the rebus below?

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?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

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

Solve the equation in the image by looking at the pattern closely.

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.