Good Riddles

Question: A farmer has 10 cows, all but six die. How many are left?

Question: I am very strong and tough but can be broken in some ways. What am I?

Question: What has a lot to say but can't be heard because it can't speak one single word?

Question: Why was the mouse afraid of the water?

Question: You went into the forest and got me,
you sat down to find me,
you went home with me because you couldn't find me.

What am I?