Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Which part of London exists in France as well ?

Find the missing number in the sequence below:

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

What part of the chicken has the most feathers?