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Ratios, Rates, Proportions 2

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This video is for the redesigned SAT which is for you if you are taking the SAT in March 2016 and beyond.

Ratios, rates, and proportions — Harder example
Erika plans to purchase seed to plant grass in a large field. She has a map of the region, and calculates the area of the region on paper to be 180 cm2. The scale on the map shows that 1 cm = 20 ft. If Erika plans to cover every 400 ft2 with one pound of seed, approximately how many pounds of seed will she ned to cover the entire field?
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