Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

How could a baby fall out of a twenty-story building onto the ground and live?

Can you quickly find which two matchstick figures are identical?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

Our product and our sum always give the same answer. Who are we?