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?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

What is the next number in the series?

15 29 56 108 208 ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

What is both possible and impossible at the same time?

What is the Surname of Barbie Doll?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

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