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Thanks @roborton .
already want to answer .
But the answer is not right . Hehee

I wonder which one is right!

the correct answer has been answered by @Herawaty @Roborton.

But there is no way for the coffee to flow through to number 4, it is closed at the tank!

Thank you friends already want to answer it. then the correct answer is Number 5 tanking right, while number 7 is closed. the tank to the left closed both numbers 9 & 4 closed.

@Roborton dan @herawaty.
😊