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The volume of water in a reservoir decreases 21,000 cubic yards over a 3-month period. What is the average change in volume per month?

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Solution:

To find the average change in volume per month, we need to divide the total decrease in volume by the number of months.

Let x be the average change in volume per month.

Then we have:

21,000 / 3 = x

Simplifying the left side, we get:

7,000 = x

Therefore, the average change in volume per month is 7,000 cubic yards.