Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

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 lying and I always lie. Tell me whether I am lying or telling the truth.

Replace the question mark with the correct number below.

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Solve the puzzle by telling what does below picture means.

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?

I am the fastest animal but cannot climb the tree. What am I?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

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