 
 <prompt> ```Dey were 50 pipo wey dey race for di bicycle charity race wen di race start. After 20 minutes, anoda 30 pipo join di race. Di total number of pipo double after anoda 30 minutes. If at di end of di race only 130 pipo finish di race, wetin be di total number of pipo wey drop before dem finish di race?``` <response>: ```At di start, dem get 50 racers, wey join by 30 more racers, so 50+30 =80 racers
After 30 more minutes, di number of racers double, making am 80*2 = 160 racers.
If di number of racers wey finish na 130, di 160-130 = 30 racers drop before dem finish.

Answer na 30.``` 