Read this: The Café Procope was established in Paris in 1686; by the 1720s there were around 400 cafés in the city. The Café Procope in particular became a center of Enlightenment, welcoming such celebrities as Voltaire and Rousseau. The Café Procope was where Diderot and D'Alembert decided to create the Encyclopédie. The cafés were one of the various "nerve centers" for bruits publics, public noise or rumour. These bruits were allegedly a much better source of information than were the actual newspapers available at the time.

By the 1720s. how many cafes were in Paris?
What is the answer? (If it cannot be answered, return "unanswerable")
around 400