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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.
Units — Harder example
In order to connect to the internet, dedicated computers are kept in a server room. To prevent overheating, the density of computers in a server room must no exceed 2.1 computers per cubic foot (1 meter is about 3.28 feet.) Which of the following densities is equal to the maximum number of computers per cubic meter?
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