13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

what does this picture(rebus) riddle means ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

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

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

What goes up but never comes down?

How many times can you subtract the number two from the number fifty?

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?