After the UK leaves, how many countries will be part of the EU?

The correct answer is 27 because, prior to the United Kingdom's exit from the European Union, there were 28 member states. After Brexit, which officially occurred on January 31, 2020, the number of EU member states decreased by one, resulting in a total of 27 countries remaining in the Union. Each of these countries continues to participate in EU governance and decision-making, alongside the various policies and regulations that govern the EU as a whole. This reflects the current structure of the EU, reinforcing the significance of membership for political, economic, and social collaboration among European nations.