I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

How many triangles are there in the picture below?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Can you guess the name of the month by looking the below rebus ?

You bought me for dinner but never eat me. What am I?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

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

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?