this is high school calculus
and i have no idea how to do this
It is reported that the Great Pyramid of Egypt was built in 20 years.
A side of its square has measures 755 feet, and its height is 410 feet.
The stone making up the Pyrimid has a density of approximately 200 pounds per cubic foot.
Assume that a typical worker lifted ten 50-pounds blocks a distance of 4 feet every hour and that he worked 10 hours a day,
300 days a year. Estimate how many workers were needed to build the Great Pyrimid of Egypt.
the answer is around xx,000 people