Here is the puzzle. 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.
Two fathers and two sons were seated round a table. There were four apples on the table. Each of them took one apple and ate it entirely yet there was still one apple left on the table. How was this possible?
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.