evan is landscaping his backyard. the backyard is shaped like a rectangleand measures 80 feet by 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.