A 2000-cy embankment requires 8% cement stabilization by dry weight. If in-situ soil weighs 105 pcf at 12% moisture, cement (tons) needed is closest to:

Why is this the answer?

Dry soil density = 105 / 1.12 = 93.75 pcf. Total dry weight = 2000 cy * 27 cf/cy * 93.75 pcf / 2000 lb/ton = 2531.25 tons. Cement required = 2531.25 * 0.08 = 202.5 tons. The provided options do not contain the correct value; 89 tons is the closest provided option if the calculation was based on wet weight (2000*27*105/2000 * 0.08 = 226.8) or other erroneous assumptions. Given the constraints, the question is flawed.

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