So the total perimeter of the pasture is 160 ft.. We know that the length of one side is 50 feet. Multiply 50 by 2 because there are 2 sides and subtract that from 160. Now we know that the total of both of the other sides is 60. Divide 60 by 2 to find the width and you find that it is 30 ft. Now multiply 30 by 50 and you get 1500. So the total area of the pasture is 1,500 feet. Hope that helps! :)