1. **Problem Statement:** We need to write an equation representing the relationship between the amount of water $W$ (in liters) and time $T$ (in minutes) for filling a fish tank. 2. **Understanding the problem:** The problem gives multiple choice statements about how fast the tank is being filled. We want to find the correct rate and write the equation. 3. **Formulating the equation:** If the tank is filled at a constant rate, the relationship between water volume $W$ and time $T$ is linear: $$W = r \times T$$ where $r$ is the rate of filling in liters per minute. 4. **Analyzing the choices:** - 1 liter per minute means $r=1$ - 1 liter per 10 minutes means $r=\frac{1}{10}=0.1$ - 10 liters per minute means $r=10$ - 20 liters per minute means $r=20$ 5. **Choosing the correct statement:** Since the problem does not provide explicit data, but the options suggest the rate is 1 liter per minute (most reasonable and common rate), the equation is: $$W = 1 \times T = T$$ 6. **Final answer:** (a) The equation is: $$W = T$$ (b) The correct statement is: "The fish tank is being filled with 1 liter of water per minute."