Register    Login    Search    Rss Feeds

Forums Home » Ask An Instructor » GMAT Math » GMAT Prep Math


 Page 1 of 1 [ 3 posts ] 



  Print view Print view Previous topic Previous topic | Next topic Next topic
 

* A complicated DC Math

Author Message
Jason.tuyj
 Post subject: * A complicated DC Math
 Post Posted: Mon Aug 29, 2011 1:32 am 
Offline
Forum Guests


Posts: 36
Development planners determined the number of new housing untis needed in a certain area by using the formular H=kJ, where H is the number of new housing units needed in the area, J is the number of new jobs to be created in the area, and k is a constant. How many new housing units did the planners determine were needed?

(1) The number of new jobs to be created was 60,000
(2) According to formular used by the planners, if 37,500 jobs were to be created, then 7,500 new housing units would be needed.


Why B doesn't answer the question, I think it also tells 7,500 new housing units needed.
Top 
cseramit
 Post subject: Re: A complicated DC Math
 Post Posted: Mon Aug 29, 2011 2:41 am 
Offline
Students


Posts: 5
Jason.tuyj wrote:
Development planners determined the number of new housing untis needed in a certain area by using the formular H=kJ, where H is the number of new housing units needed in the area, J is the number of new jobs to be created in the area, and k is a constant. How many new housing units did the planners determine were needed?

(1) The number of new jobs to be created was 60,000
(2) According to formular used by the planners, if 37,500 jobs were to be created, then 7,500 new housing units would be needed.


Why B doesn't answer the question, I think it also tells 7,500 new housing units needed.



From problem statement, H = KJ. To find H we need to know both the constant and the number of new jobs.

1) Gives us J, We dont have the value of K. Hence Insufficient.
2) Says IF the jobs are 37500 then housing units needed are 7500. [ Its a projection not the actual data.]
In other words, it gives us only K. K = H/J = 7500/37500 = 1/5.
J is not provided. Hence Insufficient.

Combining both 1 and 2, we have both K and J.
Answer should be C

Thanks
Amit
Top 
RonPurewal
 Post subject: Re: A complicated DC Math
 Post Posted: Sat Sep 03, 2011 9:18 pm 
Offline
ManhattanGMAT Staff


Posts: 7146
cseramit wrote:
Jason.tuyj wrote:
Development planners determined the number of new housing untis needed in a certain area by using the formular H=kJ, where H is the number of new housing units needed in the area, J is the number of new jobs to be created in the area, and k is a constant. How many new housing units did the planners determine were needed?

(1) The number of new jobs to be created was 60,000
(2) According to formular used by the planners, if 37,500 jobs were to be created, then 7,500 new housing units would be needed.


Why B doesn't answer the question, I think it also tells 7,500 new housing units needed.



From problem statement, H = KJ. To find H we need to know both the constant and the number of new jobs.

1) Gives us J, We dont have the value of K. Hence Insufficient.
2) Says IF the jobs are 37500 then housing units needed are 7500. [ Its a projection not the actual data.]
In other words, it gives us only K. K = H/J = 7500/37500 = 1/5.
J is not provided. Hence Insufficient.

Combining both 1 and 2, we have both K and J.
Answer should be C

Thanks
Amit


this works.

--

to the original poster: is this problem really from the GMAT PREP SOFTWARE?
if so, please post a screenshot (either directly or with a link to postimage.org).
if not, please re-post the thread in the General folder and cite the source; in that case, we'll delete the thread in about a week.
Top 
Display posts from previous:  Sort by  
 
 Page 1 of 1 [ 3 posts ] 





Who is online

Users browsing this forum: No registered users and 0 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: