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Let's solve the two parts of the problem step by step.

### (a) Mary pumped 2 gallons of water into her pool each minute for 6 minutes. What was the total change in the amount of water in the pool?
- Mary pumps **2 gallons** per minute for **6 minutes**.
- Total change in water = \( 2 \, \text{gallons/minute} \times 6 \, \text{minutes} = 12 \, \text{gallons} \).

So, the total change in the amount of water is **12 gallons**.

### (b) Chang removed 70 fish from his pond over a period of 7 days. He removed the same number of fish each day. What was the change in the number of fish in the pond each day?
- Chang removed **70 fish** over **7 days**.
- Number of fish removed per day = \( \frac{70 \, \text{fish}}{7 \, \text{days}} = 10 \, \text{fish/day} \).

So, the change in the number of fish each day is **10 fish**.

Would you like more details on any part of the solution, or do you have any other questions?

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Here are some related questions to consider:
1. If Mary had pumped 3 gallons per minute instead, how much water would she have added in 6 minutes?
2. How many fish would Chang remove if he removed 12 fish per day for 7 days?
3. If the time was reduced to 4 minutes, how much water would Mary have pumped at the same rate?
4. What if Chang removed 100 fish over 5 days? What would be the number of fish removed per day?
5. If Mary reduced her pumping rate to 1 gallon per minute, how long would it take to pump 10 gallons?

**Tip**: When working with rates, multiplying by the time period gives you the total amount or change.

Mary pumped 2 gallons of water into her pool each minute for 6 minutes. What was the total change in the amount of water in the pool? Chang removed 70 fish from his pond over a period of 7 days. He removed the same number of fish each day. What was the change in the number of fish in the pond each day?

Solve a word problem involving calculating the total change in water when 2 gallons are pumped per minute for 6 minutes and determining the daily change in fish removed from a pond over 7 days. This problem focuses on multiplication, division, and rates, suitable for Grades 4-6.

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