I think the original worksheet's been augmented at some point. Looks to me like "40 / 5" meant that you should use the same dot twice, for 5 and again for 40 - but then somebody went "oops, where's the dot for 40, the mimeograph must have eaten it" and helpfully added one in

Try it that way and you get an envelope (with two weird extra line segments at the end - maybe the original only went up to 40?)