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# what am i missing here

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Director
Joined: 23 May 2008
Posts: 743
what am i missing here [#permalink]

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15 Sep 2008, 11:56
what am i missing here?

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Manager
Joined: 28 Aug 2008
Posts: 95

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15 Sep 2008, 12:04
From the stem we can find that 120 miles is equal to 3/8 of the total.

Say the total was 200 miles, she stops after the first hundred, than the next 25, so she has covered 125/200 miles, the rest is 75/200 which is equal to 120 miles in this case.

The answer is 320 ... (120/4 = 30 , 30*8 =320)

B
Senior Manager
Joined: 09 Oct 2007
Posts: 456

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15 Sep 2008, 12:06
I get 320:

First part of the trip: 1/2
Second part of the trip: (1/2)(1/4)
Last part of the trip: (1/2)(3/4) = 120
Director
Joined: 23 May 2008
Posts: 743

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15 Sep 2008, 12:16
i was thinking that 1/2x + 1/4x + 120 = x...whats wrong with this logic?
Intern
Joined: 02 Sep 2008
Posts: 45

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15 Sep 2008, 12:27
Hey Bigtreezl,

Let's assume total distance is x.

Maria starts driving a car. Then, after driving half distance she stops.

So, Maria first draw of half distance of x. It is x/2.

again maria draw from that middle point to another 1/4 distance so it is 1/4 * x/2 = x/8.

It is not x/4. So your equation is wrong.

True equation: x/2 + x/8 + 120 = x.
Director
Joined: 23 May 2008
Posts: 743

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15 Sep 2008, 12:42
"1/4 of remaining distance" so 1/4 of 1/2.....got it thanks Twoone

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: gmat prep   [#permalink] 15 Sep 2008, 12:42
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# what am i missing here

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