If eleven plus two equals one, what does nine plus five equal?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What happened when the wheel was invented?

I look at you, you look at me, I raise my right, you raise your left. What am I?

Dr Doom invited a group of puzzle fanatics to a party which was oriented toward having puzzle-oriented games. At night, he introduced the guests to a 'unique riddle'. A prize was offered to the one who solved it first.

The guests included six people named Tom Paul, Fox Obama, Jeremy Reener, Alex Murphy, Prim Pastor, and Ellen Page. The winner of the 'unique riddle' contest was to be announced after the dinner. So Dr. Doom stood up and started the announcement:

'Okay now everybody!'
'The winner of�'
'The Hardest Riddle Ever Event'

But before he could complete it, the light went out and his voice was not heard without the mic by anyone. But they already knew who the winner was. Can you deduce the name of the winner?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Before Balboa discovered the Pacific Ocean, which was the largest ocean before that?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

Can you tell a 3D object that has just two surfaces?