I need help with this calculus question.
Some ancient Egyptians decided to build a pyramid with a square base that measured 750 feet on a side. The height of the pyramid was 500 feet. The density of the rock used in construction was 120 pounds per cubic foot.
It was assumed that the work force would remain constant. Each laborer could do 160 foot pounds of work per hour, working 12 hour days for 330 days per year for 20 years.
Determine, under these conditions, the number of laborers needed to construct the pyramid.

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Is it a solid pyramid? you know, for ceremonial purposes :)

(1/3)*(750)^2*500 ft^3 * 120lbs/ft^3 * 1hr/(160lbs)/12hrs

yeah its solid

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