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

## QUANT DS

tagged by: Brent@GMATPrepNow

This topic has 1 expert reply and 1 member reply
sandeepice@yahoo.co.in Rising GMAT Star
Joined
24 Jul 2011
Posted:
87 messages
QUANT DS Wed Sep 07, 2011 6:41 am
Elapsed Time: 00:00
• Lap #[LAPCOUNT] ([LAPTIME])
Q: A rectangular floor is to be covered with square tiles, such that the no square tiles
Overlap each other. Is 150 tiles enough to cover the floor?
A: The perimeter of each tile is 4
B: The perimeter of rectangle is 50

my answer is EE

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

Brent@GMATPrepNow GMAT Instructor
Joined
08 Dec 2008
Posted:
3891 messages
Followed by:
600 members
Thanked:
1681 times
GMAT Score:
770
Wed Sep 07, 2011 6:53 am
sandeepice@yahoo.co.in wrote:
Q: A rectangular floor is to be covered with square tiles, such that the no square tiles
Overlap each other. Is 150 tiles enough to cover the floor?
A: The perimeter of each tile is 4
B: The perimeter of rectangle is 50
We should recognize that, to answer the target question, we need information about the area of each tile and the area of the floor.

As such, we can quickly see that each statement alone is insufficient. This means the answer is either C or E.

Now let's combine the statements.

Statements 1 & 2:
From statement 1, we know that each square tile has dimensions 1x1
Statement 2 allows us to consider (at least) two cases:

case a: the floor has dimensions 24x1, in which case, we would need 24 tiles to cover the floor.
In this case, the answer to the target question is YES, 150 tiles is enough to cover the floor.

case b: the floor has dimensions 12.5x12.5, in which case, we would need 169 tiles to cover the floor.
Aside: We would need 13 tiles to cover the width of the floor and 13 tiles to cover the length of the floor. So, the total number of tiles required would equal 169 (13x13=169)
In this case, the answer to the target question is NO, 150 tiles is not enough to cover the floor.

Since we cannot answer the target question with certainty, the answer is E.

Cheers,
Brent

_________________
Brent Hanneson, BSc, BEd, MEd
- Check out GMAT Prep Now’s online course at http://www.gmatprepnow.com/
- Use our video course in conjunction with
- Watch hours of free videos on DS, RC and AWA
- Our top 3 free videos:
1) The Double Matrix method
3) Managing your time on the GMAT

Study Smart! Use Beat The GMAT’s FREE 60-Day Study Guide in conjunction with GMAT Prep Now’s video course and reach your target score in 2 months! With two money-back guarantees, you can try us out risk-free.
cans GMAT Titan
Joined
04 Apr 2011
Posted:
1308 messages
Followed by:
111 members
Thanked:
297 times
Test Date:
13th Oct
Target GMAT Score:
750+
GMAT Score:
750
Wed Sep 07, 2011 8:08 am
IMO E

_________________
If my post helped you- let me know by pushing the thanks button

Cans!!

### Best Conversation Starters

1 varun289 43 topics
2 greenwich 30 topics
3 sana.noor 21 topics
4 guerrero 20 topics
5 killerdrummer 19 topics
See More Top Beat The GMAT Members...

### Most Active Experts

1 Brent@GMATPrepNow

GMAT Prep Now Teacher

202 posts
2 GMATGuruNY

The Princeton Review Teacher

143 posts
3 Anju@Gurome

Gurome

134 posts
4 Jim@StratusPrep

Stratus Prep

86 posts
5 David@VeritasPrep

Veritas Prep

41 posts
See More Top Beat The GMAT Experts