7. If a 80 cm long grass rope is folded once and then cut at the midpoint with scissors, the sum of the lengths of the longest and shortest segments of the rope is  cm.



Translating the text into English while preserving the original format and line breaks, the result is as follows:

7. If a 80 cm long grass rope is folded once and then cut at the midpoint with scissors, the sum of the lengths of the longest and shortest segments of the rope is  cm.
【Key Point】Geometry【Difficulty】Memory
【Answer】 60
【Analysis】 $80 \div 2=40,40 \div 2=20$, the shortest is 20. The longest is 40, the sum is 60.