In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

What type of tree can I carry in my hand?

How many triangles are there in the picture below?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?