Replace the question mark with the correct number in the below-given picture?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

What part of the chicken has the most feathers?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What is the word or phrase below?
R | E | A | D

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?