Number 5 is the only one that will fill… 😀

Ah, but will 1 fill up before 5 ?

5, it’s the only one that can fill.

Once the water has reached a point in 5 which is above the entry spout from 1, the water will start to fill 1.

The lines go above where the water is coming out so it san never fill to the top only to that line so nuber 1 will fill to the top first!

I was going to say 3?

If 5 has a lid, then only 5 and 1 will fill. If there’s no lid, it will overflow and only 5 will fill.

3

Look closely folks.
The outlet from 5 is closed off so none of the rest will be filling at all!!! 🤣

Number 5 will fill to the top before overflowing

Number 1 will never fill to a level above the rim of number 5.

The red line I have drawn…
Simple physics… 😀

Christy, what is the prize for the winning answer????

Five.. 😊

6. One will, run into 5, which in turn will run into 2, then 4, 3, 6.

No 5, it is the only one that can fill, if you look at the tube coming from no 5 to no 2, it blocked off, so it can only be no 5 ( err I think!)