An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

How can you make number one disappear by adding something to it?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

What part of the chicken has the most feathers?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

In which direction should the missing arrow point?

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

What four weights can be used to balance from 1 to 30 pounds?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?