Respuesta :
It takes 0.5 minute for 1 revolution.
20.5/0.5 = 41
20.5 minutes is 41 times 0.5 minutes, so it can do 41 times as many revolutions as it can do in 0.5 minute.
41 * 1 = 41
Answer: 41 revolutions
20.5/0.5 = 41
20.5 minutes is 41 times 0.5 minutes, so it can do 41 times as many revolutions as it can do in 0.5 minute.
41 * 1 = 41
Answer: 41 revolutions