So in the supermarket you can either get 2 x 10 inch pizzas, or 1 x 20 inch pizza for £3.
They are identical pizzas, same base toppings etc
Which are better value?
And how did you work it out?
Guess? just a feeling? maths? Or another way?
assuming they are the same thickness then
two ten inch pizzas are (pi * (10/2)^2)*2 =157
one 20 inch pizza is (pi * 10^2)=314
So the 20 inch pizza is better value being twice the area of the two 10 inch pizzas
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2 10 inch pizzas. I can only eat one at a time, and I like crust. A 20 inch would be a waste and too much middle.
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I automatically used maths as I was reading the choices (although I may have just used a visual assessment if I was looking at the actual pizzas in the shop)
I guess the equation for the area of a circle is seared into my brain from school maths lessons.
I didn’t bother to go the whole hog and multiply the r squared by pi (although that was an easy mental calculation for the 20 inch pizza)
I just mentally calculated the large pizza had a radius squared of 100 and the two smaller pizzas had a radius squared of 25 each, therefore their surface areas added together would total only half of the large pizza.
In terms of value for money, from my perspective, I am not likely to work my way through a 20 inch pizza in a month of Sundays!
I usually look for small pizzas if I’m buying them to cook at home -
5 - 7 inch diameter is enough for me - any larger and I cut it into slices before cooking it and freeze the individual slices so I don’t have to cook it all at once.
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You could weigh them on the fruit and veg scales. 
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The pommies have these pizza problems completely under control.
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Nor me - It was 100 * 3.14 and the other two would be half that, it took considerably longer to type than calculate.
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Who gives a shite. Buy 2x10inch, eat one, save one for later. Sorted.
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Do you want it cut into 8 or 12 slices?
To be fair, that’s probably what a lot of people would do in real life.
But it’s not real life, it’s a maths/logic problem to see if we can work it out……so FAIL!
I saw this elsewhere and what interested me was the different ways people worked it out
You got the mathematicians, those who checked the weight, those who just guessed….
Me I’m a visual/physical person so I just pictured the small pizzas stuck on top of the big one, and you’d get all that extra around the edges (apologies if it looks like boobs or a face)
So if you were feeding a family or yourself on a budget and needed most food for your dosh, it’s the biggy everytime, you vould freeze it in slices……
……. 10 slices obviously, because then you’d get more pizza……….
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Now I know where I’m going wrong - I would usually cut a 10 inch pizza into 8 slices but I get full after eating half a 10 inch pizza and can’t eat any more.
Maybe if I cut it into only 4 slices next time, I’ll be able to eat the whole pizza! 
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I have never been asked, they just cut it in 8 slices and hand it to me in the box. I am not that fond of pizza so only have it perhaps once or twice a year, usually when one or more of the kids visit
I am astounded at the number of specialist pizza places within a 5 to 10 minute walk of my house
- Dominos
- Pizza Hut
- Pinocchios
- Crust
- Julios
- Get Stoned Pizza
- Massimo Papa
- Chaseyboy
- A Pizza bar at the Leagues Club ( the furthest, probably 8 minutes walk away)
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I don’t do slices, just down it.
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I don’t do maths or logic and that’s the sum of my problem.
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Is that in life in general, or just pizza?
It’s definitely the in thing with the youngsters and their go to take away
Like you, we tend to have it when the kids come calling hungry