There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

What word begins and ends with an E, but has only one letter?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

What is the difference between a jeweller and a jailer?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Forwards I am heavy, backward I am not. What am I?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?