An old classic this week. You have a straight-sided glass of orange juice that is filled to the brim like this…..
As ever, please do NOT post your answers, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.
And while you are thinking about it, here is a terrifying video (via@rpaulwilson)
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.