Look at the picture and find out which square is not linked with any of the other squares.

Which letter of the alphabet has the most water?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

What is the end of everything?

What's a single-digit number with no value?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()