What is the next number in the series?

15 29 56 108 208 ?

How can a man go eight days without sleep?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?