Forum Home > GMAT > Quantitative > Problem Solving (PS)
Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Jan 1911:00 AM IST
-01:00 PM IST
Attend this session to evaluate your current skill level, learn process skills, and solve through tough Arithmetic questions
Jan 1810:00 AM PST
-11:00 AM PST
In this video, we talked to Rishi, an ambitious Indian student who successfully secured admission into HEC Paris and ESSEC Business School, two of the top Masters in Management (MiM) programs in Europe.- Jan 20
12:01 AM PST
-11:59 PM PST
On Monday the 20th GMAT Club Tests will be Absolutely Free! Including all the Quizzes, Questions, and Tests. 12 AM - 11:59 PM PST - Jan 20
10:00 AM PST
-11:00 AM PST
Join us for an inspiring talk with Dhruvi, an ambitious Indian student who secured admission to Imperial College London's prestigious Masters in Management (MiM) program. In this podcast, Dhruvi shares her candid journey... - Jan 21
09:00 AM PST
-10:00 AM PST
If you're aiming for top MBA programs like Stanford, Harvard, or Wharton, this video is your ultimate guide to crafting a standout application that B-schools can't ignore! We'll walk you through: - Jan 22
08:00 AM PST
-09:00 AM PST
In this video, two MBA interview experts and a communications coach holds a mock interview of a prospective MBA applicant. The experts assess the responses of the applicant on important interview questions and provide their feedback. 
Jan 2410:00 AM EST
-12:00 PM EST
The Target Test Prep team is proud to introduce GMAT OnDemand, a video course created by Scott Woodbury-Stewart, founder and CEO, designed to provide you with everything you need to master the GMAT and achieve your score goals.- Jan 25
11:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.
06 Oct 2010, 06:09
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
81% (00:58) correct
19%
(01:00)
wrong
based on 229
sessions
History
Date
Time
Result
Not Attempted Yet
What is the % change in the area of a rectangle when its length increases by 10% and its width decreases by 10%?
A. 0%
B. 20% increase
C. 20% decrease
D. 1% decrease
E. Insufficient data
A. 0%
B. 20% increase
C. 20% decrease
D. 1% decrease
E. Insufficient data
06 Oct 2010, 06:24
Kudos
Bookmarks
pzazz12
What is the % change in the area of a rectangle when its length increases by 10% and its width decreases by 10%?
A. 0%
B. 20% increase
C. 20% decrease
D. 1% decrease
E. Insufficient data
A. 0%
B. 20% increase
C. 20% decrease
D. 1% decrease
E. Insufficient data
General formula for percent increase or decrease, (percent change):
\(Percent \ change=\frac{Change}{Original}*100\).
\(area_{original}=lw\) and \(area_{new}=1.1l*0.9w=0.99lw\) --> \(Percent \ change=\frac{Change}{Original}*100=\frac{lw-0.99lw}{lw}*100=1%\) decrease.
Answer: D.
12 Oct 2010, 13:16
Kudos
Bookmarks
Substitute if you don't know the formula.
First "rectangle" can be 10x10 so area is 100
Increase length by 10% and decrease width by 10% so 11x9 area is 99
100-99=1 sqft
1sqft is a 1% change from a 100 sqft rectangle.
First "rectangle" can be 10x10 so area is 100
Increase length by 10% and decrease width by 10% so 11x9 area is 99
100-99=1 sqft
1sqft is a 1% change from a 100 sqft rectangle.
