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.
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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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