The dimensions of the box are 6 by 4 by 20. To find the surface area of the box, multiply 6 by 4, 4 by 20, and 20 by 6. The answers for those is 24, 80, and 120. Add those all together to get 224. Then, multiply that by 2 since 224 is only half of the surface area. The answer is actually 448 square inches, not 512. Hope this helps!
