If it took eight men ten hours to build a wall, how long would it take four men to build it?

Can you count the number of triangles in the picture below?

I travel all around the world but always stay in the corner. What am I?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

I don't get anymore wetter, no matter how much rain falls on me.

John is 45 years older than his son Jacob. If you find similarities between their ages, both of their ages contain prime numbers as the digits. Also, John's age is the reverse of Jacob's age.

Can you find their ages?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?