Question
A flask can fill up 9 bottles. A bottle can fill up 5 bottles. 1 flask and 2 bottles can fill up a tank. How many bottles are needed to fill up the tank?
4 m

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A flask can fill up 9 bottles. A bottle can fill up 5 bottles. 1 flask and 2 bottles can fill up a tank. How many bottles are needed to fill up the tank?