Hello rickjosh
When you share 6 pizza's with 20 people, that means 6/20 = 0,3 pizza per person maximal. As this does not work out with the number of possible toppings (3 per pizza max) you will have several angry politicians because they get less pizza (or a collection of some very small added slices) than their peers. And the distribution of pizza slices will be a total mess.
Besides that : will a vegetarian accept 1/3 of a pizza that has a meat topping on the remaining 2/3 only ? Does not sound very 'kosher'! Specially attention for the cheese cover of that pizza, as some vegetarians also refuse milk products.
I strongly suggest to give the town clerk a cheap calculator, so that he/she can calculate the extra cost for ordering 7 pizza's. Or collect some money to pay for the additional pizza. This will produce 21 slices of 1/3 pizza each, it will be easier to distribute and share, and keep the meeting more pleasantly. And the mayor can have the remaining 1/3 pizza to build-up some extra strength against the continuously infighting council members...
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There are 10 different toppings. If you buy 7 pizza's you have 7 x 3 toppings (of any type).
With 20 people that means that at least two people share the same topping.
As to the vegetarian toppings : I doubt that there are 3 or more different vegetarian toppings.
So I hold further calculations till that info becomes available... :)
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