What is a word made up of 4 letters yet is also made up of 3

Question: What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Question: What do you get when you cross a cheetah and a burger?

Question: You have 20 sick sheep, one dies. How many are left?

Question: What tastes better than it smells?

Question: How Do You Make Chicken Napoleon?

Question: What goes in the water black and comes out red?