Who’s paying attention then?

[Old Mod]

When are you going to solve my one Mark?

 

[Blunt Tool]

Puff puff 3 wheeze

 

[Old Mod]

Puff puff 3 wheeze

Baaa Baaa Baaa!

 

[One Day]

When are you going to solve my one Mark?

it pains me to answer when the word 'firstly' was used.
the correct answer is 3.
the water is either blocked, or lost in each other case.

 

[One Day]

Left

but why?!

 

[Old Mod]

Unfortunately Mark, I did not produce the image. I just copied it straight in to the post.

 

[Old Mod]

but why?!

Because you’re adding the weight of the ping pong ball and string.
Whereas the Steel ball is suspended, therefore there is no extra weight.

 

[LM]

The part where it says “the sides are in balance” and “of the same volume”gives it away!

 

[One Day]

 

[One Day]

We should post stuff like this on the plumbers forum.
Got to be good for a laugh, or would it be some kind of discriminatory hate-crime???
Would be funny though...

 

[Old Mod]

Oh well, I was half right haha
It was just the wrong half hehe nice one!

 

[Dumbo]

only 5 can be filled.

Why . Is it because the tube protrudes lower into 4 . Because if so water finds its own level and will fill the receptacle and tube as well . 4 is also filled from a lower point than 5 .

 

[Old Mod]

Why . Is it because the tube protrudes lower into 4 . Because if so water finds its own level and will fill the receptacle and tube as well . 4 is also filled from a lower point than 5 .

It’s 3 Jerry, enlarge the image and look closely at the pipes.

 

[Old Mod]

Well done all those who got it right

Tut tut @tommyzooom haha

 

[Blunt Tool]

http://i0.kym-cdn.com/photos/images/newsfeed/000/357/026/2ff.gif