by Dan Meyer

• 1. Which do you think is cheaper: a shower or bath? Why?

• video — bath and shower

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

• video — duration of shower and bath
• video — water rate in minutes per gallon
• image — the cost of water in Mountain View, CA

• 3. How would the situation have to change for the answer to reverse itself?
• 4. How long of a shower can he have with the same amount of water he used for the bath? [via Twitter user park_star]
• 5. Which is cheaper for you? Collect data on your own shower and bath usage.
• 6. Which is cheaper for your class? Average the data from all your classmates.