There is a field fenced in by a rectangular fence. Bob counts 20 fenceposts on one side and 18 on the other. If the fence posts are 2 feet apart, how big is the field, in square feet?
18 posts make for 17 spaces 17 x 2 = 34 ft
20 posts make 19 spaces 19 x 2 = 38
38 x 34 = 1292 sq ft
18 posts make for 17 spaces 17 x 2 = 34 ft
20 posts make 19 spaces 19 x 2 = 38
38 x 34 = 1292 sq ft