Which number should replace the question mark?

What do you get if you add 2 to 100 four times?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you decipher the two rows to find the hidden word?

The more it dries, the wetter it becomes. Can you tell what it is?

Prove that twice of ten is the same as twice of eleven.

Can you count the number of triangles in the given picture?

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.