by Dan Meyer

• 1. How long will it take the tank to fill up?
• 2. Guess as close as you can.
• 3. Give an answer you know is too high.
• 4. Give an answer you know is too low.

• video — the tank begins to fill

• 5. What information will you need to know to solve the problem?

• image — the side length of the octagon
• image — the distance across the octagon
• image — the height of the octagonal prism
• image — conversion from cubic centimeters to ounces
• video — filling up 16 ounces

• video — the tank fills up completely

• 6. How long will it take the tank to empty?

• video — the tank begins to empty
• video — emptying out 16 ounces
• video — the tank empties completely