At the start, there were 50 racers, who were joined by 30 more racers, thus 50+30 =<<50+30=80>>80 racers
After 30 more minutes, the number of racers doubled, totaling 80*2 = 160 racers.
If the number of racers who finished is 130, the 160-130 = 30 racers dropped before finishing.
#### 30