Ms. Duncan’s class wants to estimate how many blades of grass are in a rectangular section of the school yard measuring 25 feet by 40 feet. The students cut 1-inch-by-1-inch squares out of sheets of paper and place these square holes over patches of grass in that section. Each student counts how many blades of grass show through their square hole. On average, the students find 38 blades of grass in each hole.  Using this information, determine about how many blades of grass are in that rectangular section. Explain your reasoning.

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