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5 will be the only one that will ever fill up unless you really crank up the pressure in which case 7 will also fill but very slowly. 5 and 7 are open containers and there's a hole in the bottom of 4. But if it's water coming out of a tap then only 5 will fill .
The connection between 2 and 3 is blocked.
Damn, I didn't even notice that.
Even if you assume that it is not blocked, it is still 5. The pipe from 2 to 3 is never reached because 4 leaks out the hole in the bottom. Assume that the hole in the bottom is a flaw and 4 still leaks out the top before the pipe to 3 is reached.
Didn't notice that.
1 can also fill up if the flow from the faucet is higher than what can exit through the pipe connecting to 2.
There it is!!! That connector is too narrow, only way it isnt 1 is if the pressure is criminally low.
Someone's never been to the UK... But also the volume of 5 is significantly less than 1.