Quote from Lobster:
There are certain alien beings in a room who are all identical. Each has exactly one hand with a certain number of fingers. (Of course, that number of fingers per hand is the same for all of the aliens, since they are identical.) There is more than one of those aliens in that room and each one has more than one finger on his hand. Other than those aliens, there is nothing else in the room. The total number of fingers in that room is greater than 200 and less than 300. If I told you the exact number of fingers in that room then you would know exactly how many fingers each one of the aliens has on his hand. How many aliens are in the room?