I saw this a while back, 6

3

9 as 6 appears to be sealed. Really need a better plumber to sort this out.

6,7,9 if those other tubes are closed. if they are open, 3,6,7,8,9

The answer is 9 because you're not supposed to ignore the errors

6, and then that bucket overflows indefinitely. 😎

3!!! Are we debating for fun??? Let’s do it!!! OK I’m going w 9 actually. The welder was highly regarded.

9 😎

If the pressure is low enough that the water can flow without overflowing the initial drop, then three will fill and then overflow indefinitely and that's it. But if the pressure is higher, that changes it.

I assume the question is : - which bucket will be filled last?