Answer:
I contain six letters, minus one and you got twelve. What am I?
Poor people have it. Rich people need it. If you eat it you die. What is it?
I am a word of letters three. Add two and fewer there will be. What word am I?
What has 3 feet but no toes?
I go in dry and come out wet. The longer I stay in the stronger my surroundings get.
No matter how little or how much you use me, you change me every month.