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og ps 129

by simba12123 » Mon Oct 27, 2008 10:02 am
on a recent trip, cindy drove her car 290 miles, rounded tro the nearest 10 miles, and used 12 galons of gas, rounded to the nearest gallon. Te actual number of miles per gallon that cindy car got on this trip must have been?

a 290/12.5 and 290/11.4
b. 295/12 and 284/11.4
c. 284/12 and 295/12
d. 284/12.5 and 295/11.4
e.295/12.5 and 284/11.4


qa is d

however I am trying to find the easiest quickest way to tackle this question.


what is the most straightforward way of doing this?
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by logitech » Mon Oct 27, 2008 10:16 am
I think the original OG explanation is very straight forward. My only problem with this problem is how the answers defined the round up

290 needs to be between 285 and 294! NOT 284 and 295 ??????????
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by dmateer25 » Mon Oct 27, 2008 10:26 am
logitech wrote:I think the original OG explanation is very straight forward. My only problem with this problem is how the answers defined the round up

290 needs to be between 285 and 294! NOT 284 and 295 ??????????

Did the question say the MPG must have been? or must have been BETWEEN?
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by logitech » Mon Oct 27, 2008 10:35 am
dmateer25 wrote:
logitech wrote:I think the original OG explanation is very straight forward. My only problem with this problem is how the answers defined the round up

290 needs to be between 285 and 294! NOT 284 and 295 ??????????

Did the question say the MPG must have been? or must have been BETWEEN?

8) Thank you!
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exactly

by simba12123 » Mon Oct 27, 2008 11:24 am
Logitech.. we are in the same boat in regards to viewing 285 and 294. THe way I saw the constraints of the mpg is 285-294, which will yield 290 as the corrected rounded number. May I dare to say that there is a typo?
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Re: exactly

by logitech » Mon Oct 27, 2008 11:28 am
simba12123 wrote:Logitech.. we are in the same boat in regards to viewing 295 and 294. THe way I saw the constraints of the mpg is 285-294, which will yield 290 as the corrected rounded number. May I dare to say that there is a typo?
Simba, I did not like the way they constructed this question either. The word BETWEEN is playing a role but...I am not 100 % sure what the heck is going on ;-)
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Re: exactly

by Ian Stewart » Mon Oct 27, 2008 11:45 am
simba12123 wrote:Logitech.. we are in the same boat in regards to viewing 285 and 294. THe way I saw the constraints of the mpg is 285-294, which will yield 290 as the corrected rounded number. May I dare to say that there is a typo?
There is no typo. The problem has been discussed here:

www.beatthegmat.com/official-guide-prob ... 18729.html
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com
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by dmateer25 » Mon Oct 27, 2008 11:52 am
This one is a little confusing. When I looked at it at first I was confused, but then realized that the MPG had to be between one of the answer choices.

Min MPG would be 285/12.4 = ~22.98
Max MPG would be 294/11.5 = ~25.56

so the mpg are somewhere between 22.98 and 25.56

If you solve the solutions

a 290/12.5 and 290/11.4..............23.2 and 25.44
b. 295/12 and 284/11.4................24.58 and 24.91
c. 284/12 and 295/12...................23.66 and 24.58
d. 284/12.5 and 295/11.4.............22.72 and 25.87
e.295/12.5 and 284/11.4..............23.6 and 24.91

Now you have to look and see which range includes both numbers 22.98 and 25.56.

and you can quickly see that the only possible answer choice would be D.
I don't recommend attempting to do all of that work, but I just wanted to elaborate on how the answer is D.


Hope this helps
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ok

by simba12123 » Mon Oct 27, 2008 5:05 pm
mmmmmmm AHA! thanks folks.. I just needed to beat down the answer choices a bit further. Dmateer25 - we think and solve questions in a very similiar manner.
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