Chalking Five Olympic Rings in Beijing

You are the world’s best field chalker and China wants you to do the stadium field for the opening ceremonies of the 2008 Summer Games. To be sure to get it right, you plan to bring your own chalk. Every 50 square feet of ground you cover uses one pound of chalk. The five Olympic Rings will each have an outer radius of 100 feet and an inner radius of 90 feet. You are allowed two 70 pound check-in bags each on the airline without an additional fee. Will you have to pay extra to take your chalk to China? Neglect any overlap between the rings. (Hint: calculate how much chalk it will take to do one ring and go from there.)

Bonus question: Why are there five Olympic rings?

Answers are in the Teacher Only area "".