How many Pizzas are sold in London every day?

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How many Pizzas are sold in London every day?

Here's the solution:

The ideal way to approach this question is through the supply side. That is, if we can estimate the number of pizza restaurants and the number of pizzas each sell a day, we should be able to figure out the number of pizzas sold. Yes, there are also pizzas sold at supermarkets which we will keep aside for this one.

Compartmentalizing London

First, in trying to estimate the number of pizzas restaurants in London let us first break London into different zones and locations. If you have stayed in London, then you will know that Londoners are proud of their extensive public transport network. Probably the best in the world.

The city has 11 tube lines in addition to a well spread overground rail network. Estimating that each tube line has say around 25 stations we get approximately 275 stations. The actual number is 270 - so we are not far. If in an interview you are 20 to 30% away from the actual number, you may be veered back by the interviewer or may be allowed to carry on.

Additionally, let’s say London has approximately half as many overground stations as that of the underground. That is ap