1 by 2, 2 by 3, 4 by 5 and anything else by anything else. It's all possible. When you order soup in India, that is. A very common practice that experts say results in more soup per serving per person than if one were to ask for an extra bowl and split it themselves! In fact, I even know people that do this for takeout!
Can you imagine the restaurant doing this though? Will they actually fill out two bowlfulls, then take a 3rd one and evenly split from the other 2? Or are they so used to this strange request that the guy is a pro at it and knows exactly how many ladles go into each? Whatever it is, the request has never fazed anyone in any place that I've been to. The only requirement is that the person doling out the soup has to be a math whiz...how else would they understand 23/30 should such a request come by??
On a related note, I wonder if this tactic would work with alcohol. Margheritas please...3 by 4 but all for 1!