They are, a turtle, a snail, and a fish. A turtle's house is a shell which is on top of its back so it takes it everywhere, so does the snail and the fish's house is the water which can be everywhere in water.

"Are you asleep?"

All hats were white because it took the others too long to figure it out. If there were 2 red hats the guy with the white hat would know instantly. If there were two white hats he would figure it out sooner because they are the wisest people in the land.

30 because 20 of them ate chicken.

The trains were not on the same track.

Meat.

The dog ate the jewel.

The tenth day.

You take the fifth chain and open all three loops then connect all four chains together and it makes a line.

Yin-Yang

He was on the first step of the ladder when he fell.

Path.