You go to a halloween fair with a big ferris wheel. the wheel has ten seats, and two people are placed on each seat. every minute a seat passes by the exit platform. at 11 a. m. the ferris wheel opens for 30 minutes - how many people have ridden the wheel during this time?

42

Explanation:

The Ferris wheel opens for 30 minutes at 11 a.m. Now, the first seat is filled at 11 a.m. Every minute a seat passes by the platform so every minute a seat is filled. This means that from 11:00 a.m. to 11:09 a.m. the seats are filled. At 11:10 a.m., the ride starts. From 11:10 to 11:30, the time duration is 21 minutes. Each minute a seat passes by the exit platform and 2 people leave the ride through the exit platform. Hence, a total of 42 people have ridden during this time.

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