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修路队修一条公路,第一天修了全长的一半少30米,第二天修了余下的一半多20米,还剩下50米,这条公路全长多少米?
Road repairing a road repair team, the first day of repair less than half of the full length of 30 meters, the next day more than half of the remaining 20 meters, leaving 50 meters, how many meters the length of the road?