I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Can you replace the question mark with the correct number?

What time is it when an elephant sits on a fence?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

What is the word or phrase?

What is harder to catch the faster you run?

What is the coolest letter in the alphabet?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?