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 Post subject: GRE Logic (Select One)Posted: Mon Feb 28, 2011 5:44 pm

Joined: Sun May 30, 2010 3:15 am
Posts: 424
If a runner in a marathon had the 37th fastest time and the 50th slowest time, how many runners finished the marathon?

A. 83
B. 84
C. 85
D. 86
E. 87

(D)If the runner had the 37th fastest time, that means 36 runners finished before the runner. If the runner had the 50th slowest time, that means 49 runners finished after the runner. Therefore the total number of runners who finished the marathon is 36 + 1 + 49 = 86.
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The language of the question is incorrect. In the same marathon, how can a runner be 37th and 50th?

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 Post subject: Re: math (t. 2, qt. 2): logic reasoning.Posted: Mon Feb 28, 2011 5:51 pm

Joined: Sun May 30, 2010 2:23 am
Posts: 498
Quote:
the 37th fastest time
means the runner is 37th when we arrange the set of runners (who finished) in ascending order: from the fastest time to the slowest time.

Quote:
the 50th slowest time
means the runner is 50th when we arrange the set of runners (who finished) in descending order: from the slowest time to the fastest time.

When we arrange the runners in ascending order (by time), the standing positions are the following:

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