Albert Einstein’s water tank quiz!

Albert Einsteins Water tank puzzle

Albert Einstein’s puzzle post!

The water tank quiz!

Many of us parents are now on summer vacation with our children so I thought I’d come away from Minecraft a little and have a bit of fun!

We see many problems posted on social media testing our IQ and this one is pretty good!

Can you solve this problem from Albert Einstein in under 15 seconds?

what water tank will fill up first? leave your comment below!




So Did you do it?

Think you’re clever?

Scroll down to find out the Answer!


Did you know there is actually a book full of how Albert Einstein solved these puzzles? Are you up for the challenge?

If you are the book is called :

USA: Think Like Einstein: Think Smarter


Think Smarter - Albert Einstein






If you prefer the actual puzzle book then the Albert Einsteins Puzzles will be better for you!

USA: Albert Einstein Puzzles   UK: Albert Einstein Puzzles

Puzzle Universe








If you like this puzzle I have just published another puzzle!

Albert Einsteins Numbers Riddle! Feeling Clever? Click here!


Check out The Answer to the Water Tank Puzzle! Click Here! 






74 Replies to “Albert Einstein’s water tank quiz!”

        1. If you don’t look at the whole picture you would think it would be k good to go back and look again

          1. There is not enough data to answer the question correctly. Let me explain the flow rate of the water is not listed. There for depending on flow rate it can be G or A if the rate is slow enough G will fill first but if the flow rate is faster than the diameter of pipe in container A can handle the A will fill first. So not enough data to come to proper conclusion.

          2. This is very true if it was a physical experiment as you have rightly pointed out, many factors have to be taken into account, I’m sure when this puzzle was created it would of take it into account however this is just a simple digital version of the puzzle and the link below will take you through to a video of it in action, the rate of flow is at a consistent slow rate.


        1. Hi Tim

          If you look at the entry tunnels in tank J, the one to tank I will only ever reach the same level as the tunnel to Tank L, Water will always find the quickest route.

          here’s a link to you tube showing you, there are also other other videos here showing you aswell


  1. I think it’s j. But to those who think it’s g, your wrong. Look closer at c,d, and e. D is blocked from being filled by c. And there is no other way for water to get to e. I would also like to point out that I am 13 and I noticed that small detail in 10 seconds.

  2. I thought it was G. But the water can’t get in to D due to the blockage. So that leaves F to fill first. F F F F F F F

  3. K will fill first. The water level can’t get up to L until it gets above the line in the J tank. It can’t get past that line until I fills, for I to fill K has to fill first.

  4. i cant see any blockage to G.
    assuming flow rate is in equilibrium to A’s outlet from initial tap, G is the right answer

    @ADMIN put us out of our misery already !!

  5. Water cannot get into D so neither D, E or G will not get any water as won’t H. Water will find its own level starting at the lowest level in this case F.

  6. The answer is F.
    First we eliminate cups that are impossible to get water because the pipes are blocked. Those cups are D, and its downflow cups E and G. In addition, H is also eliminated as its downflow entry point is blocked.
    Next we find that all active downflow entry points are situated BELOW the rims of the cups. So A, B, C, J, and I are eliminated because they are higher than the rim of the three remaining lower cups, F, K, and L.
    Therefore, either F, K, or L will be the first cup to fill. How to determine? The key is to determine which pipe the water will exit from on cup J.
    On J, the left exit pipe will receive the downflow water first. However, the downflow has to travel upward to near the top of the downflow entry point on cup I. Before the overall level of the water can reach that point, though, it will be stuck at the level of the right exit pipe of J. Therefore, the water will go down the right exit pipe and enter L, and immediately drain down the bottom downflow exit pipe, and completely fill that pipe. Since H is blocked, the water’s only downflow exit is actually through the bottom of cup F. Now the water will rise up cup F and cup L until the water overflows at F, whose rim is slightly below L, at which point the water overflows over the rim of F and no other water rises happen anywhere else.

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