(iii) If paper products accounted for 33% of the total MSW recycled in 2010 and about 7 m^3 of landfill space is saved for each metric ton of paper products recycled, calculate how much landfill space was
saved by recycling paper products in 2010 in the United States.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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the answer is true. hope it .