A book costs $1 plus half its cost. How much does it cost? The answer is not $1.50 because when you do $1+$0.50, you assume the cost of the book is $1 (that's why you added the $0.50) but at the end, you say the answer is $1.50. Check out the video to see an algebraic solution for this tricky question on Reddit r/facepalm and r/theydidthemath Original post: https://www.reddit.com/r/theydidthemath/s/dHfmXCIQuW Shop my math t-shirts & hoodies on Amazon: 👉 https://amzn.to/3qBeuw6 ----------------------------- 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 👉 https://www.patreon.com/blackpenredpen. Every bit of support means the world to me and motivates me to keep bringing you the best math lessons out there! Thank you! ----------------------------- #math #algebra #mathbasics