There are forty elephants and they have forty-fore heads. How can this be possible?

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.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

How many sides does a circle have?

Can you solve the maths in the below-given picture equation?