After the many debates online, such as the famous one about what colour the dress was (blue and black or white and gold), there is now a new question that is dividing internet users. And it’s about… pizza. It all started with a tweet from Fermat’s Library’s Twitter account, that suggested a mathematical calculation for the size of the Ninja Turtles’ favourite meal.This message received 1,200 responses and was retweeted more than 20,000 times in just a few hours alone, proving that everyone was interested in this debate. According to this tweet, it’s better to order one 18-inch pizza instead of ordering two pizzas measuring 12 inches each.A very precise mathematical calculationAt first, the result looks quite surprising, but there is a precise calculation that backs up this idea. An 18-inch pizza has a surface area of 0.16 metres squared, whilst two pizzas measuring 12 inches have a surface area of just 0.14 metres squared. We’ll spare you the maths behind it, since it’s probably enough to make your head spin.Lots of reactionsAfter this result was posted, lots of twitter users reacted in some quite weird and wonderful ways. ‘The crust is arguably the best part and two 12-inch pizzas have 33.3% more crust than an 18-inch pizza. And now I’m hungry, thanks @fermatslibrary!’ wrote one twitter user. ‘The pizza industry has known this for years but kept their studies hidden. Thanks for speaking truth to power, Andy’ wrote another user.‘Finally! I can now coherently explain to my 10-year-old why math is important in life: without math, you might unknowingly spend more for less pizza!’ commented yet another twitter user. So now you know what you should do next time you order pizza. Order one big pizza instead of two little ones!Check out the video above for the full explanation!