Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 22
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemandStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

EXECUTIVE ASSESSMENT

with

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions

hard question!

Expert replies
by bupbebeo » Tue Apr 13, 2010 4:19 am
Ditrama is a federation made up of three autonomous regions. Korva, Mitro, and Guadar. Under the federal revenue-sharing plan, each region receives a share of federal revenues equal to the share of the total population of Ditrama residing in that region, as shown by a yearly population survey. Last year, the percentage of federal revenues Korva received for its share decreased somewhat even though the population survey on which the revenue-sharing was based showed that Korva's population had increased.

If the statements above are true, which one of the following must also have been shown by the population survey on which last year's revenue-sharing in Ditrama was based?

A. Of the three regions, Korva had the smallest number of residents.
B. The population of Korva grew by a smaller percentage than it did in previous years.
C. the populations of Mitro and Guadar each increased by a percentage that exceeded the percentage by which the population of Korva increased.
D. Of teh three regions, Korva's numerical increase in Population was the smallest
E. Korva's population grew by a smaller percentage than did the population of at least one of the other two autonomous region.
Join the discussion
Source: — Critical Reasoning |

by kevincanspain » Tue Apr 13, 2010 4:27 am
If E were false, then K's share of the population could have have fallen and thus nor could its share of the revenues. Since its share did fall, E must be true.

Nice question, what is the source?
Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid
Join the discussion

by CrazyGmatter » Tue Apr 13, 2010 5:18 am
@kevin..

I chose D...Can u please elaborate on why you chose E..
Join the discussion

by kevincanspain » Tue Apr 13, 2010 6:11 am
bupbebeo wrote:Ditrama is a federation made up of three autonomous regions. Korva, Mitro, and Guadar. Under the federal revenue-sharing plan, each region receives a share of federal revenues equal to the share of the total population of Ditrama residing in that region, as shown by a yearly population survey. Last year, the percentage of federal revenues Korva received for its share decreased somewhat even though the population survey on which the revenue-sharing was based showed that Korva's population had increased.

If the statements above are true, which one of the following must also have been shown by the population survey on which last year's revenue-sharing in Ditrama was based?

A. Of the three regions, Korva had the smallest number of residents.
B. The population of Korva grew by a smaller percentage than it did in previous years.
C. the populations of Mitro and Guadar each increased by a percentage that exceeded the percentage by which the population of Korva increased.
D. Of teh three regions, Korva's numerical increase in Population was the smallest
E. Korva's population grew by a smaller percentage than did the population of at least one of the other two autonomous region.
The information presented in the text might seem contradictory.

On the one hand, each region receives a share of revenues equal to the share of the total population of Ditrama residing in that region.
On the other hand, Korva's population increased (according to the offical survey).

How could both be true? The population of K, but not its share of the total, has increased. For this to happen, it must be that at least one of the other regions saw a greater percentage increase in population. D need not be true, as we are talking about percentages, not absolute figures. If K's population were larger than that of the other two regions combined, D could easily be false
Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid
Join the discussion

by kevincanspain » Tue Apr 13, 2010 6:40 am
Nor can we conclude that K's population increase was the smallest in percentage terms, as C indicates. We only know that it cannot be the largest in %terms

For example

Last This
K 100 110 (from 40% to about 30% of total)
M 100 105
G 200 500
Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid
Join the discussion

by harshavardhanc » Tue Apr 13, 2010 10:01 am
bupbebeo wrote:Ditrama is a federation made up of three autonomous regions. Korva, Mitro, and Guadar. Under the federal revenue-sharing plan, each region receives a share of federal revenues equal to the share of the total population of Ditrama residing in that region, as shown by a yearly population survey. Last year, the percentage of federal revenues Korva received for its share decreased somewhat even though the population survey on which the revenue-sharing was based showed that Korva's population had increased.

If the statements above are true, which one of the following must also have been shown by the population survey on which last year's revenue-sharing in Ditrama was based?

A. Of the three regions, Korva had the smallest number of residents.
B. The population of Korva grew by a smaller percentage than it did in previous years.
C. the populations of Mitro and Guadar each increased by a percentage that exceeded the percentage by which the population of Korva increased.
D. Of teh three regions, Korva's numerical increase in Population was the smallest
E. Korva's population grew by a smaller percentage than did the population of at least one of the other two autonomous region.
https://www.beatthegmat.com/ditrama-popu ... 50545.html
Regards,
Harsha
Join the discussion

by deepesh.gupta » Sat Apr 17, 2010 4:42 am
Hi KEvin,

I opted for C becase that only gives 100% gaurantee that K's share in revenue would decrease. While in E, the lower increase in one can offset the higher increase in other, keeping the K's share same or even more. Could you please elaborate on why C is wrong.

BTW, what is OA?

kevincanspain wrote:Nor can we conclude that K's population increase was the smallest in percentage terms, as C indicates. We only know that it cannot be the largest in %terms

For example

Last This
K 100 110 (from 40% to about 30% of total)
M 100 105
G 200 500
Join the discussion