Page 1 of 1 [ 2 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: data sufficiency pg. 54 #30Posted: Fri Aug 13, 2010 1:03 am

Joined: Thu Jul 08, 2010 11:09 pm
Posts: 33
hello
i used this formula
G1 + G2 + N - B =total

10 + 65 -B = 150

75-B=150

B = 75

therefore 75/150 * 100 is the total % of men across both groups.

i chose c, why is this wrong

Top

 Post subject: Re: data sufficiency pg. 54 #30Posted: Fri Aug 13, 2010 10:29 am

Joined: Thu Jul 03, 2008 2:13 pm
Posts: 117
Hey TJ,

The problem with this formula is that 150 is the total number of PEOPLE, whereas 10 and 65 only represent the total number of MEN. Because we don't know the total number of men, we can't set up a A + B - Both = Total calculation.

Keep in mind that Data Sufficiency questions are more about logic than they are about math. In high school, your main job was to determine where to put the numbers in "the formula". Because the GMAT is preparing you for graduate school, it's more about your ability to determine whether the formula even applies. Here, because some values are in terms of one group (men) and some in terms of another (people), the formula just doesn't apply, and that's what they're testing.

Top

 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Page 1 of 1 [ 2 posts ]

 All times are UTC - 8 hours [ DST ]

#### Who is online

Users browsing this forum: No registered users and 2 guests

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

 Search for: