The wait time to ride a roller coaster is 20 minutes when 160 people are in line. At this rate, how long is the wait time when 220 people are in line?

Answer 1

Just use ratios:
time/220 = 20/160
time = 220(20/160) = 27.5 minutes

Answer 2

220 / 160 = 1.375

20 * 1.375 = 27.5

27.5 minutes