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?
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Answer:
21 couples ride
Step-by-step explanation:
At the beginning of min 1, there is a seat at the entrance. Therefore the first couple is already seated when the time count begins.
At the end of min 1, the second couple sits in. This goes on and on and at the end of min 9, the 10th couple boards and the wheel is full.
At the end of min 10 the first couple alights and couple 11 boards. This goeas on until the end of min 20 when the 11th couple alights and the 21st couple boards.
From the min 21 to min 30, the couples alight at the exit but no other couple boards because they would not have the chance to alight before the 30th min ends.
Therfore in total, 21 couples ride
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