Welcome! Check out our free B-School Guides to learn how you compare with other applicants.

## Word problem- data sufficiency problems

This topic has 2 expert replies and 1 member reply
\'manpreet singh Really wants to Beat The GMAT!
Joined
22 May 2012
Posted:
151 messages
Followed by:
1 members
Thanked:
2 times
Test Date:
24/06/2013
Target GMAT Score:
700+
Word problem- data sufficiency problems Thu Jun 28, 2012 8:39 pm
Elapsed Time: 00:00
• Lap #[LAPCOUNT] ([LAPTIME])
Q.1)If Car X followed Car Y across a certain bridge that is 1/2 mile long, how many seconds did it take Car X to travel across the bridge?
(1) Car X drove onto the bridge exactly 3 seconds after Car Y drove onto the bridge and drove off
the bridge exactly 2 seconds after Car Y drove off the bridge.
(2) Car Y traveled across the bridge at a constant speed of 30 miles per hour.

Q.2)What percent of the drama club members enrolled at a certain school are female students?
(1) Of the female students enrolled at the school,40 percent are members of the drama club.
(2) Of the male students enrolled at the school,25 percent are members of the drama club.

Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!

### GMAT/MBA Expert

Anurag@Gurome GMAT Instructor
Joined
02 Apr 2010
Posted:
3835 messages
Followed by:
466 members
Thanked:
1749 times
GMAT Score:
770
Thu Jun 28, 2012 8:48 pm
\'manpreet singh wrote:
Q.1)If Car X followed Car Y across a certain bridge that is 1/2 mile long, how many seconds did it take Car X to travel across the bridge?

(1) Car X drove onto the bridge exactly 3 seconds after Car Y drove onto the bridge and drove off the bridge exactly 2 seconds after Car Y drove off the bridge.
(2) Car Y traveled across the bridge at a constant speed of 30 miles per hour.
Statement 1: All we know is that X takes 1 second less to cross the bridge than Y.

Not sufficient

Statement 2: We don't know the speed of X or relation of speed of X with that of Y.

Not sufficient

1 & 2 Together: We know speed of Y. Hence, we can determine how much time it will take to cross the bridge. Therefore, we can determine how much time X will take to cross the bridge.

Sufficient

The correct answer is C.

Note : If anyone is interested in the calculation (which is really not necessary)...
Y will take (1/2)/30 hours = 1/60 hours = 60 seconds to cross the bridge.
Hence, X will take (60 - 3 + 2) = 59 seconds to cross the bridge.

_________________
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/

### GMAT/MBA Expert

Anurag@Gurome GMAT Instructor
Joined
02 Apr 2010
Posted:
3835 messages
Followed by:
466 members
Thanked:
1749 times
GMAT Score:
770
Thu Jun 28, 2012 8:56 pm
\'manpreet singh wrote:
Q.2)What percent of the drama club members enrolled at a certain school are female students?

(1) Of the female students enrolled at the school,40 percent are members of the drama club.
(2) Of the male students enrolled at the school,25 percent are members of the drama club.
Looking at the statements I can guess that none of them are individually sufficient as none of them provides a definite relation between the number of female members and total number of members. Hence, I'm going to analyze the problem taking both statements into consideration.

Say, the school has M male students and F female students.
Hence the drama club has M/4 male members and 2F/5 female members.
Hence, required percentage = (2F/5)/(M/4 + 2F/5)

As we don't know M and F or the relation between M and F, we cannot determine the percentage.

The correct answer is E.

_________________
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/

\'manpreet singh Really wants to Beat The GMAT!
Joined
22 May 2012
Posted:
151 messages
Followed by:
1 members
Thanked:
2 times
Test Date:
24/06/2013
Target GMAT Score:
700+
Thu Jun 28, 2012 11:55 pm
Thanks for the quick reply!!

### Best Conversation Starters

1 varun289 38 topics
2 killerdrummer 22 topics
3 sana.noor 20 topics
4 Books_Love 14 topics
5 guerrero 14 topics
See More Top Beat The GMAT Members...

### Most Active Experts

1 Brent@GMATPrepNow

GMAT Prep Now Teacher

204 posts
2 GMATGuruNY

The Princeton Review Teacher

136 posts
3 Jim@StratusPrep

Stratus Prep

100 posts
4 Anju@Gurome

Gurome

74 posts
5 Jon@Admissionado

Admissionado

51 posts
See More Top Beat The GMAT Experts