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.
Dec 1410:00 AM EST
-12:00 PM EST
Think a 100% GMAT Verbal score is out of your reach? Target Test Prep will make you think again! Our course uses techniques such as topical study and spaced repetition to maximize knowledge retention and make studying simple and fun.
Dec 1411:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test.
Dec 1310:00 AM EST
-12:00 PM EST
Have you ever wondered how to score a PERFECT 805 on the GMAT? Meet Julia, a banking professional who used the Target Test Prep course to achieve this incredible feat. Julia's story is nothing short of an inspiration.- Dec 15
11:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease. 
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!- Dec 17
09:00 AM PST
-10:00 AM PST
Join Manhattan Prep instructor Whitney Garner for a fun—and thorough—review of logic-based (non-math) problems, with a particular emphasis on Data Sufficiency and Two-Parts. - Dec 18
10:00 AM PST
-11:00 AM PST
Here is the essential guide to securing scholarships as an MBA student! In this video, we explore the various types of scholarships available, including need-based and merit-based options.
30 Mar 2020, 08:30
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
69% (02:14) correct
31%
(02:24)
wrong
based on 388
sessions
History
Date
Time
Result
Not Attempted Yet
The authors of a recent article examined warnings of an impending wave of extinctions of animal species within the next 100 years. These authors say that no evidence exists to support the idea that the rate of extinction of animal species is now accelerating. They are wrong, however. Consider only the data on fishes: 40 species and subspecies of North American fishes have vanished in the twentieth century, 13 between 1900 and 1950, and 27 since 1950.
The answer to which one of the following questions would contribute most to an evaluation of the argument?
(A) Were the fish species and subspecies that became extinct unrepresentative of animal species in general with regard to their pattern of extinction?
(B) How numerous were the populations in 1950 of the species and subspecies of North American fishes that have become extinct since 1950?
(C) Did any of the species or subspecies of North American fishes that became extinct in the twentieth century originate in regions outside of North America?
(D) What proportion of North American fish species and subspecies whose populations were endangered in 1950 are now thriving?
(E) Were any of the species or subspecies of North American fishes that became extinct in the twentieth century commercially important?
The answer to which one of the following questions would contribute most to an evaluation of the argument?
(A) Were the fish species and subspecies that became extinct unrepresentative of animal species in general with regard to their pattern of extinction?
(B) How numerous were the populations in 1950 of the species and subspecies of North American fishes that have become extinct since 1950?
(C) Did any of the species or subspecies of North American fishes that became extinct in the twentieth century originate in regions outside of North America?
(D) What proportion of North American fish species and subspecies whose populations were endangered in 1950 are now thriving?
(E) Were any of the species or subspecies of North American fishes that became extinct in the twentieth century commercially important?
03 Apr 2020, 09:58
Kudos
Bookmarks
Bunuel
The authors of a recent article examined warnings of an impending wave of extinctions of animal species within the next 100 years. These authors say that no evidence exists to support the idea that the rate of extinction of animal species is now accelerating. They are wrong, however. Consider only the data on fishes: 40 species and subspecies of North American fishes have vanished in the twentieth century, 13 between 1900 and 1950, and 27 since 1950.
The answer to which one of the following questions would contribute most to an evaluation of the argument?
(A) Were the fish species and subspecies that became extinct unrepresentative of animal species in general with regard to their pattern of extinction?
(B) How numerous were the populations in 1950 of the species and subspecies of North American fishes that have become extinct since 1950?
(C) Did any of the species or subspecies of North American fishes that became extinct in the twentieth century originate in regions outside of North America?
(D) What proportion of North American fish species and subspecies whose populations were endangered in 1950 are now thriving?
(E) Were any of the species or subspecies of North American fishes that became extinct in the twentieth century commercially important?
The answer to which one of the following questions would contribute most to an evaluation of the argument?
(A) Were the fish species and subspecies that became extinct unrepresentative of animal species in general with regard to their pattern of extinction?
(B) How numerous were the populations in 1950 of the species and subspecies of North American fishes that have become extinct since 1950?
(C) Did any of the species or subspecies of North American fishes that became extinct in the twentieth century originate in regions outside of North America?
(D) What proportion of North American fish species and subspecies whose populations were endangered in 1950 are now thriving?
(E) Were any of the species or subspecies of North American fishes that became extinct in the twentieth century commercially important?
There are in total four assumptions we need to look for. Here are they follows:
1. Is it correct to extrapolate the extinction of acceleration of animal species from a the extinction of particular species?
2. Is any one species getting extinct represent the correct representation for the entire animal group? This represent answer choice "A".
3. If one species if getting extinct, is it necessary the entire animal species is getting extinct?
04 Apr 2020, 15:30
Kudos
Bookmarks
Quote:
A is the right answer in my opinion.
The authors of a recent article examined warnings of an impending wave of extinctions of animal species within the next 100 years. These authors say that no evidence exists to support the idea that the rate of extinction of animal species is now accelerating. They are wrong, however. Consider only the data on fishes: 40 species and subspecies of North American fishes have vanished in the twentieth century, 13 between 1900 and 1950, and 27 since 1950.
The answer to which one of the following questions would contribute most to an evaluation of the argument?
The authors of a recent article examined warnings of an impending wave of extinctions of animal species within the next 100 years. These authors say that no evidence exists to support the idea that the rate of extinction of animal species is now accelerating. They are wrong, however. Consider only the data on fishes: 40 species and subspecies of North American fishes have vanished in the twentieth century, 13 between 1900 and 1950, and 27 since 1950.
The answer to which one of the following questions would contribute most to an evaluation of the argument?
Conclusion: They (the authors) are wrong.
Premise: Consider only the data on fishes: 40 species and subspecies of North American fishes have vanished in the twentieth century, 13 between 1900 and 1950, and 27 since 1950.
The argument above concludes that the authors of a recent article that examined warnings of an impending wave of extinctions of animal species within the next 100 years and that concluded that no evidence exists to support the idea that the rate of extinction of animal species is now accelerating are wrong. Why does he/she think so? He/she based his/her conclusion on the fact that 40 fish species and subspecies of North American fishes have vanished within the twentieth century with a further breakdown of the pattern of extinction over half a century. Our task is to determine which of the answer choices would most contribute to an evaluation of the argument above.
An assumption of the argument above is that the trend of extinction of fishes in North America represents the trend of extinction of animal species in general. If this is not assumed, then the argument above will crumble. So we need to determine whether truly the trend quoted as a premise for the argument to conclude that authors are wrong represents the general trend worldwide not only for fish species but also animal species in general.
Quote:
(A) Were the fish species and subspecies that became extinct unrepresentative of animal species in general with regard to their pattern of extinction?
Correct per the reasoning above.Quote:
(B) How numerous were the populations in 1950 of the species and subspecies of North American fishes that have become extinct since 1950?
Per the reasoning above, this is incorrect since it doesn't provide us with any information to enable the establishment of a correlation between the extinction of fish species in North America and the animal species in the world as a whole.Quote:
(C) Did any of the species or subspecies of North American fishes that became extinct in the twentieth century originate in regions outside of North America?
Who cares if any of the subspecies of the North American fishes that became extinct in the twentieth-century originate in regions outside of North America? We just need a correlation between the data on the extinction of fish species of North America and the animal species in the world. C is thus incorrect because it doesn't provide this link.Quote:
(D) What proportion of North American fish species and subspecies whose populations were endangered in 1950 are now thriving?
Out of scope and definitely irrelevant as the argument is about extinct species and not endangered species.Quote:
(E) Were any of the species or subspecies of North American fishes that became extinct in the twentieth century commercially important?
The commercial importance of the extinct species and subspecies of North American fishes in the twentieth-century is out of scope and thus irrelevant. 
