Garden Outside A House

Riddle: If a yellow house is made of yellow bricks and a red house is made of red bricks, what colour bricks is a greenhouse made out of?

Answer:

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Source: https://riddles.com/8566

If a yellow house is made of yellow bricks and a red house is made of red bricks, what colour bricks is a greenhouse made out of? — Garden Outside a House by Samuel Harper Riddle