I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What number should come in place of the question mark below?

Do you know who was buried in John's tomb?

Can you write down eight eights so that they add up to one thousand?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

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

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

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

Imagine you are in a room with no windows or doors. How will you get out?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?