Can you replace the question mark with the correct number in the below table sequence?

I can write cow in 13 letters.

Can You?

I have no life, but I can die. What am I?

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

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

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?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

If eleven plus two equals one, what does nine plus five equal?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Count the number of triangles in the given picture.