Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

Can you solve the below tricky visual equation?

In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10?

Why do you find that most of the buildings are deprived of the 13th floor?

A father's child, a mother's child, yet no one's son.

Who am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

I have branches, but no fruit, trunk or leaves. What am I?

Which tank will fill first?

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.