If 21x = 79x, what is the value of x?

what does this picture(rebus) riddle means ?

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.

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

When we see 2 but call 10?

Can you place six X (crosses) in below board without making three in a row in any way ?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Identify the 10 differences between the two given pictures.