Riddles

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When I eat, I live; but when I drink, I die, What am I? (fire)

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Q: What can't be used until it's broken?
A: An egg.

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A: How many apples can you eat if your stomach is empty?
B: 4 or 5
A: No, that's wrong, because after eating one apple your stomach isn't empty.

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There was a green house. Inside the green house there was a white house. Inside the white house there was a red house. Inside the red house there were lots of babies. What is it?

A watermelon.