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# what am i missing here

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Director
Joined: 23 May 2008
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what am i missing here [#permalink]  15 Sep 2008, 10:56
what am i missing here?
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Manager
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Re: gmat prep [#permalink]  15 Sep 2008, 11:04
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
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Re: gmat prep [#permalink]  15 Sep 2008, 11:06
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
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Re: gmat prep [#permalink]  15 Sep 2008, 11:16
i was thinking that 1/2x + 1/4x + 120 = x...whats wrong with this logic?
Intern
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Re: gmat prep [#permalink]  15 Sep 2008, 11:27
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
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Re: gmat prep [#permalink]  15 Sep 2008, 11:42
"1/4 of remaining distance" so 1/4 of 1/2.....got it thanks Twoone
Re: gmat prep   [#permalink] 15 Sep 2008, 11:42
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