A and B are running a 100-meter race. When A is 32 meters away from the finish line, B is 15 meters away from the finish line. When A is 20 meters away from the finish line, how many meters away from the finish line is B?
甲乙两人进行百米赛跑，当甲离终点32米时，乙离终点15米，那么甲离终点20米时，乙离终点多少米．
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