Stage: 3 
The three blind mice stole a piece of cheese. In the night, the first mouse ate 13 of the cheese. Later, the second mouse ate 13 of the remaining cheese. Finally, the third mouse ate 13 of what was then left of the cheese.
Between them, what fraction of the cheese did they eat?
Between them, what fraction of the cheese did they eat?
I think the answer is 19/27
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