It seems easy... but is it?

Anyone know the answer?

 

Good question. I say 3 but I can't give you a solid explanation why I think that's the answer.

 

At first I thought it was 3 too. Now I think it's 4 because the water will continue to flow into 4 until it's full only then 3 will get full too. So it's either 3 or 4.

 

But in order for water to get into the 4th tank it has to travel against the forces of gravity. Idk I am really curious to know the answer now haha.

 

I mean in this scenario:

 

4 cannot be filled UNTIL 3 is full. 1 and 2 will never fill as both 3 and 4 will overflow.

 

Yep the more I think about it the more I am certain this is accurate.

 

I go with 3, as well.

 

easy or hard ,depends on mental status.go confidently.

 

4?