Hard Science Question?

Question

How many tons of coal are contained in one acre of a coal seam that is six feet thick, if the density of the coal is 90 pounds per cubic foot? Show Work Please

Answer 1

(43560 sq ft/acre X 6 ft X 90 lb/ft^3)/2000 lb/ton = 11761.2 tons

Answer 2

How many square feet in an acre( use conversion charts) multiply by six(the depth of the seam), multiply by 90(pounds per cubic foot) and divide by 2,000(pounds in a ton).
That is how, now, you use some graphite.

Answer 3

One acre is 43560 ft^2

multiply by 6 ft

multiply by density

convert to tons