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A certain vent releases steam every 20 minutes. If the vent
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27 Mar 2018, 16:19
27 Mar 2018, 16:19
Expert Reply
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Question Stats:
90% (01:10) correct
9% (01:59) wrong based on 42 sessions
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A certain vent releases steam every 20 minutes. If the vent releases steam at 6:25 p.m., which of the following could be a time at which the vent releases steam?
A. 9:15 p.m.
B. 10:40 p.m.
C. 11:00 p.m.
D. 12:20 p.m.
E. 1:05 a.m.
A. 9:15 p.m.
B. 10:40 p.m.
C. 11:00 p.m.
D. 12:20 p.m.
E. 1:05 a.m.
Drill 2
Question: 2
Page: 549
Question: 2
Page: 549
Sherpa Prep Representative
Joined: 15 Jan 2018
Posts: 147
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Re: A certain vent releases steam every 20 minutes. If the vent
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29 Mar 2018, 19:05
29 Mar 2018, 19:05
1
Expert Reply
Since there are 60 minutes in an hour, and since 60 is cleanly divisible by 20, we can see that the vent will release steam exactly 3 times per hour. So it will always vent at times ending in :25, :45, and :05. The only one of these options that appears is answer choice E.
Re: A certain vent releases steam every 20 minutes. If the vent
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04 Apr 2018, 15:54
04 Apr 2018, 15:54
2
Expert Reply
Explanation
Rather than listing out the actual times, figure out the pattern.
The vent releases steam at 25, 45, and then 5 minutes after 6 p.m., and repeats this pattern every hour thereafter.
Only choice (E) fits the pattern.
Rather than listing out the actual times, figure out the pattern.
The vent releases steam at 25, 45, and then 5 minutes after 6 p.m., and repeats this pattern every hour thereafter.
Only choice (E) fits the pattern.
