If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

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?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

John was piloting a plane behind a car but was never able to overtake it. Why?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?