what's the probability of getting a king or a queen from a pack of 52 cards?

The centre of the third figure is empty. What digit should fit inside?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

It belongs to you, but other people use it more than you do. What is it?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

What runs around the whole yard without moving?

What is the fastest way to double your money?