Solving a minimum percentage problem

If 70% of a group of people like coffee and 80% of them like tea, what is the minimum percentage that like both? The common mistake for this tricky percentage problem is that many people would simply multiply the percentages. Don't do that! ------------------ I help students master the basics of math. You can show your support and help me create even better content by becoming a patron on Patreon 👉   / blackpenredpen  . Or shop for math t-shirts & hoodies 👉 https://amzn.to/3qBeuw6 Every bit of support means the world to me and motivates me to keep bringing you the best math lessons! Thank you! ------------------ #math #algebra #mathtutorials