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.
Jul 0901:00 PM EDT
-02:00 PM EDT
More Target Test Prep students are earning 100th percentile GMAT scores. Don’t settle for less when the Target Test Prep course gives you everything you need to score high on the GMAT. Start your 5-day free trial today.
Jul 1311:00 AM EDT
-12:30 PM EDT
Looking for your GMAT motivation to break through the score plateau? Pragati improved her score by massive 160 points with strategic guidance and hard-work! Find out how personalized mentorship and a strong mindset can turn GMAT struggles into success.
Jul 1508:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
Jul 1609:30 AM EDT
-11:30 AM EDT
Is INSEAD your dream b-school and you're looking for solid prep and application strategies to get there? Check out Barkavi’s end-to-end journey to know how she did! Get insights into the INSEAD admissions process, know what Adcoms look at, and more!
Jul 1611:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
Jul 1911:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
26 Apr 2019, 07:23
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
79% (00:50) correct
21%
(00:45)
wrong
based on 893
sessions
History
Date
Time
Result
Not Attempted Yet
What was the population of City X in 2002 ?
(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
(2) In 2001, X's population was 1,000,000.
ID: 700126
DS99502.01
(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
(2) In 2001, X's population was 1,000,000.
ID: 700126
DS99502.01
adkikani
DavidTutorexamPAL nick1816 VeritasKarishma MentorTutoring
St 1:
X's population in 2002 increased by 2 percent over 2001. -> P(2001) * 1.02 = P(2002)
i.e.
X's population in 2002 increased by 20,000 people over 2001. -> P (2002) = P (2001) + 20,000
Suff.
Unfortunately, hurriedly I too selected C with this thought:
To find a final value, I need initial value and change of %tage or difference hence I need to use St 2.
I could not form two linear eqs of (1) under timed conditions.
Hello, adkikani. Keep in mind that with DS questions in particular, you often do not need to actually solve the problem to answer the question. Here, we are asked about an exact value of a population at a specific point in time: we need to be able to determine the population of City X in 2002, nothing more. A quick scan of the two statements reveals that they both provide information on 2001, so STOP. Ask yourself, what would we need to know about 2001 to determine the population for 2002? Either a rate of growth with some sort of total attached or a difference in the total number of people, as long as you had a baseline population, would do. Now you can assess the statements. I like to start with the easier looking of the two, so I would pick (2) first.Quote:
What was the population of City X in 2002 ?
(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
(2) In 2001, X's population was 1,000,000.
Could you advise what is incorrect in below approach:(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
(2) In 2001, X's population was 1,000,000.
St 1:
X's population in 2002 increased by 2 percent over 2001. -> P(2001) * 1.02 = P(2002)
i.e.
X's population in 2002 increased by 20,000 people over 2001. -> P (2002) = P (2001) + 20,000
Suff.
Unfortunately, hurriedly I too selected C with this thought:
To find a final value, I need initial value and change of %tage or difference hence I need to use St 2.
I could not form two linear eqs of (1) under timed conditions.
Clearly, Statement (2) does not deliver on our pre-thinking for the problem. We get a population from the year before, but nothing more. With no basis for comparison, we cannot predict what happened the next year. Mark off (B) and (D) as answer choices. How about Statement (1)?
Aha. If 2 percent corresponds to 20,000 people, and you understand that there was a growth or increase in population, then you could calculate the population in either 2001 or 2002. Note that without the word increased, the change would be unknown, whether the population had gone up or down, and the answer would be insufficient. As is, however, you could work out pretty quickly that 1 percent of 1,000,000 is 10,000 just by moving the decimal two places to the left, so two 1 percents would be 2 * 10,000, or 20,000 people. Thus, the original population was 1,000,000, and we know that Statement (1) is SUFFICIENT. The answer is (A).
I did not do anything more than solve this one through reasoning. Whenever you encounter DS problems, always ask yourself three things:
1) What is the question asking?
2) What do I know? (i.e. What information is provided?)
3) What would I need to know to answer the question that is being asked?
Such an approach can spare you all the work sometimes, and you will be less prone to falling into traps. I hope this may help you in your studies.
- Andrew
06 Apr 2020, 02:31
Kudos
Bookmarks
adkikani
DavidTutorexamPAL nick1816 VeritasKarishma MentorTutoring
St 1:
X's population in 2002 increased by 2 percent over 2001. -> P(2001) * 1.02 = P(2002)
i.e.
X's population in 2002 increased by 20,000 people over 2001. -> P (2002) = P (2001) + 20,000
Suff.
Unfortunately, hurriedly I too selected C with this thought:
To find a final value, I need initial value and change of %tage or difference hence I need to use St 2.
I could not form two linear eqs of (1) under timed conditions.
Quote:
What was the population of City X in 2002 ?
(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
(2) In 2001, X's population was 1,000,000.
Could you advise what is incorrect in below approach:(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
(2) In 2001, X's population was 1,000,000.
St 1:
X's population in 2002 increased by 2 percent over 2001. -> P(2001) * 1.02 = P(2002)
i.e.
X's population in 2002 increased by 20,000 people over 2001. -> P (2002) = P (2001) + 20,000
Suff.
Unfortunately, hurriedly I too selected C with this thought:
To find a final value, I need initial value and change of %tage or difference hence I need to use St 2.
I could not form two linear eqs of (1) under timed conditions.
You don't have to form linear equations. This is what I thought when I read statement 1.
(1) X's population in 2002 increased by 2 percent, or 20,000 people, over 2001.
So, 2% of 2001 population is 20,000. This means I can get 2001 population. This means I can add 20,000 to it and get 2002 population.
Sufficient.
(2) In 2001, X's population was 1,000,000.
Ok, I have 2001 population. But what about 2002 population? By how much did it increase/decrease compared with 2001 population? Not given.
Not sufficient.
