You can see it everyday, But cannot touch it at will. What is it?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.

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?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Which five letter word can be added at the end of below word to form a
valid word?

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Can you name an animal whose killing cannot be performed without spilling your own blood?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Replace the question mark with the correct number in below Picture:

Find the next number in the series below

21 32 54 87 131 ?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?