A box which is 20 inches long, 8 inches wide and 2 inches high is to be completely wrapped with paper. If a single sheet of paper is to used without patching, then the dimensions of the paper could be?

答案是21 in by 24 in. 应该是由该长方体完全展开，得到结果。哪位NN能帮助解答一下？谢谢！

其实20乘24就可以了。20的边可以折成2+8+2+8，24的边可以折成2+20+2，其中2是高，8是宽，20是长，这样肯定可以折出一个长方体，当然还有些剩余（剩余两个2X2的正方形，两个2X10的长方形）。画个图很容易看出来。