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SW-User
4 if by filled you mean up to the top.

SW-User
Nope. 3rd . When 3rd will be filled upto the top, then 4th will get water.

SW-User
No. The third has to be filled up to the point where it flows into the 4th container. So the 4th will be filled up to the top, then the 3.
If it's just semi to the top then it's the third.
If it's just semi to the top then it's the third.

SW-User
@GermanAf: oh. You taken the diagram to be exact accurate to the top. The diagram is drawn with rough hands. But your concept is right.

SW-User
:)