evan landscaping his backyard backyard shaped rectangleand measures 80 feet 70 feet he wants

evan is landscaping his backyard. the backyard is shaped like a rectangleand measures 80 feet by 70 feet. he wants to spread topsoil evenly over the entire surface. one load will cover 400 square feet, 4 inches deep.how many loads does even need in order to cover the entire surface.
 

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