Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What brings you down but never up?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

What always comes into a house through the keyhole?

Who is that with a neck and no head, two arms and no hands? What is it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

There is a place where if I stand up straight, I will still be considered sideways.