## Act 1

1. How long will the filter last?

2. Write down a guess.

## Act 2

3. What information would be useful to figure this out?

4. Write down some questions you have in your head right now.

## Act 3

## Sequel

5. What would happen if the filter had a capacity of 250 gallons?

**Common Core Standards**

6.RP

Understand ratio concepts and use ratio reasoning to solve problems.

8.G.C.9

Know the formulas for the volumes of cones, cylinders, and spheres and use them to solve real-world and mathematical problems.

**TEKS**

6.4(B)

apply qualitative and quantitative reasoning to solve prediction and comparison of real-world problems involving ratios and rates

8.7(A)

solve problems involving the volume of cylinders, cones, and spheres