I have feet, but no legs. Which animal Am I?

What do you get if you add 2 to 100 four times?

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?

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?

What brings you down but never up?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

I am white when I am dirty, and black when I am clean. What am I?

What can go through glass without breaking it?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I can write cow in 13 letters.

Can You?