A city generates 650 tons per day of municipal solid waste (MSW) with the following locally determined material characteristics.
On each Monday, Tuesday, Thursday, and Friday the MSW is collected by packer trucks that hold 20 cubic yards of MSW. No collection occurs on Wednesday because it is a day that is used to perform truck repairs and other maintenance. MSW from one-fourth of the city is collected on each of the collection days. The landfill where this MSW is taken for disposal has a total design volume of 5,931,250 cubic yards. Over the years, eighty percent (80%) of this landfill's volume has already been filled. Assume that the population, the MSW generation rate, and the characteristics of the MSW will not change in the future.
If a packer truck can compact MSW to the maximum density and if it can make 3 trips to the landfill each collection day, how many tons of MSW can one truck transport to the landfill each collection day? (If the max density is 700 yd^3)
The answer is 21 tons but I don't know how to get that answer.
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