Events & Promotions
| Last visit was: 06 Sep 2026, 16:17 |
It is currently 06 Sep 2026, 16:17 |
|
|
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.
Sep 0712:01 AM PDT
-11:59 PM PDT
On the 7th, GMAT Club Tests will be Free! Including all the Quizzes, Questions, and Tests. 12 AM - 11:59 PM PDT- Sep 07
10:00 AM PDT
-11:00 AM PDT
A complete walkthrough of GMAT Club’s free 12-week GMAT study plan: what you study each week, how progress and goals are tracked, how the error log works, and how your practice unlocks paid tools at no cost. 
Sep 0201:00 PM EDT
-11:59 PM EDT
Take 30% off all study plans with code COURSEWORK - Expires on Monday 9/7
Sep 0410:00 AM EDT
-11:59 PM EDT
We’ve worked incredibly hard to build TTP into the best test prep experience possible, and it would mean a lot to us to win Newsweek’s 2026 Readers’ Choice Award for Best Test Prep. If TTP has helped you, we’d be incredibly grateful for your vote.
Sep 0609:30 AM EDT
-12:30 PM EST
Top scores are possible when you enroll in a powerful EA course, taught live online + 6 months access to TTP OnDemand video courses included! Perfect class schedule and easy course access for working professionals. Class starts Sundays Sept. 6, 2026.- Sep 09
07:00 AM PDT
-10:00 AM PDT
Meet AdComs and explore top Master’s programs - MiM, MiF, MSc, MSBA and more. - Application Fee Waivers - Free 1-Week of GMAT Club Tests: - Master's Application Toolkit - Grand Prize Giveaway - Sep 09
10:00 AM PDT
-11:00 AM PDT
Three MBA applications. Three rejections. No interview invites. A year later, Aman was admitted to Cambridge Judge, SMU, and IMD. In this episode of MBA Admit Stories, Aman shares how he rebuilt his MBA application... 
Sep 1507:00 PM EDT
-09:00 PM EST
Elite scores are possible when you enroll in a powerful GMAT course, taught live online + 6 months access to TTP OnDemand video courses included! Class starts Tues/Thurs Sept. 15, 2026 - Nov. 15, 2027, 7:00pm-9:00pm EST
Sep 2108:00 PM EDT
-10:00 PM EDT
Boost your GMAT score in less than one month in a live online class + 6 months access to TTP OnDemand video courses included! Class starts Mon, Tues, Wed, Thur, Fri Sept. 21, 2026 - Oct. 9, 2027, 7:00pm-10:00pm EST
06 May 2026, 11:55
Kudos
Bookmarks
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
64% (01:31) correct
36%
(02:13)
wrong
based on 238
sessions
History
Date
Time
Result
Not Attempted Yet
In the country of Boldavia at present, only 1 percent of 80-year-olds are left-handed, whereas 10 percent of 50-year-olds and 15 percent of 20-year-olds are left-handed. Yet over the past 80 years, the proportion of Boldavians who are born left-handed has not increased, nor have Boldavian attitudes toward left-handedness undergone any important changes.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
(C) Ambidexterity is highly valued in Boldavia.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
(C) Ambidexterity is highly valued in Boldavia.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
06 May 2026, 13:15
Kudos
Bookmarks
In the country of Boldavia at present, only 1 percent of 80-year-olds are left-handed, whereas 10 percent of 50-year-olds and 15 percent of 20-year-olds are left-handed. Yet over the past 80 years, the proportion of Boldavians who are born left-handed has not increased, nor have Boldavian attitudes toward left-handedness undergone any important changes.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger Boldavians have a much higher rate of left-handedness, even though the birth rate of left-handedness has not increased and attitudes have not changed. So the explanation must come from survival or population composition, not from more people being born left-handed or more people admitting it.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed and men die earlier on average, then older age groups will contain proportionally fewer men and therefore fewer left-handed people. This explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This removes one possible explanation but does not explain the age-based difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. This does not explain why different age groups have different rates of left-handedness, especially since attitudes have not importantly changed.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives only an upper limit. It does not explain the pattern among 20-year-olds, 50-year-olds, and 80-year-olds.
Answer: (A)
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger Boldavians have a much higher rate of left-handedness, even though the birth rate of left-handedness has not increased and attitudes have not changed. So the explanation must come from survival or population composition, not from more people being born left-handed or more people admitting it.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed and men die earlier on average, then older age groups will contain proportionally fewer men and therefore fewer left-handed people. This explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This removes one possible explanation but does not explain the age-based difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. This does not explain why different age groups have different rates of left-handedness, especially since attitudes have not importantly changed.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives only an upper limit. It does not explain the pattern among 20-year-olds, 50-year-olds, and 80-year-olds.
Answer: (A)
06 May 2026, 23:30
Kudos
Bookmarks
In the country of Boldavia at present, only 1 percent of 80-year-olds are left-handed, whereas 10 percent of 50-year-olds and 15 percent of 20-year-olds are left-handed. Yet over the past 80 years, the proportion of Boldavians who are born left-handed has not increased, nor have Boldavian attitudes toward left-handedness undergone any important changes.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger groups have much higher rates of left-handedness, even though left-handed birth rates and social attitudes have not changed. So the explanation must involve some other factor, such as who survives into older age. The key idea is that the older population may have a different gender composition.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed, but men are also less likely to survive to age 80, then the 80-year-old group will contain fewer men and more women. Since women are less often left-handed, this explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This rules out one possible explanation, but it does not explain the age difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. Since attitudes have not changed importantly, this does not explain why younger and older groups differ.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives a general limit, but it does not explain the specific pattern across ages.
Answer: (A)
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger groups have much higher rates of left-handedness, even though left-handed birth rates and social attitudes have not changed. So the explanation must involve some other factor, such as who survives into older age. The key idea is that the older population may have a different gender composition.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed, but men are also less likely to survive to age 80, then the 80-year-old group will contain fewer men and more women. Since women are less often left-handed, this explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This rules out one possible explanation, but it does not explain the age difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. Since attitudes have not changed importantly, this does not explain why younger and older groups differ.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives a general limit, but it does not explain the specific pattern across ages.
Answer: (A)
14 Jul 2026, 00:36
Kudos
Bookmarks
OE for reference:
Overview:
The passage first presents a somewhat puzzling fact: there are surprisingly large differences among Boldavians in the incidence of left-handedness by age group. The explanation of this fact is what is at issue in the question. The passage itself rules out two possible lines of explanation.
The Correct Answer:
A If Boldavian men have a shorter average life expectancy than Boldavian women do, it is plausible, as one goes from one age group to the next, in ascending order of age, that a smaller proportion of people in each successive age group are men. This would mean that any quality—such as left-handedness, or being more than 6 feet tall—that is more common among men than it is among women would be less prevalent in successively older age groups. (A) says that Boldavian men live less long, on average, than Boldavian women and also says that left-handedness is more common among men. (A) therefore helps to explain the observed variation, by age, of left-handedness among Boldavians.
The Incorrect Answer Choices:
B If it were true that left-handed Boldavians were more likely than right-handed ones to be the victims of fatal accidents, then accidents could very well have the effect, over time, of increasing the proportion of right-handers in the population. But (B) says that there is no difference between left-handed and right-handed people in terms of how likely they are to be involved in accidents. So (B) does nothing to help explain the age-related variation in left-handedness among Boldavians.
C (C) might give rise to a tendency for Boldavians who are not strongly right-handed or left-handed to declare themselves ambidextrous. But even if there were such a tendency, it would not explain the variation in incidence of left-handedness by age group.
D A decreasing birthrate affects population size and relative numerical strength of age groups. But with nothing further having been said, a decrease in the birthrate has no implications for the distribution of specific characteristics, such as left-handedness, within an age group. Therefore, (D) by itself does not help explain the variation in incidence of left-handedness by age group.
E This statement suggests that the proportion of left-handed people in the overall population of Boldavia may fluctuate somewhat. This may indicate that the disparities in left-handedness across age groups are not necessarily constant. But this does not help explain why those sorts of disparities exist in the first place.
Overview:
The passage first presents a somewhat puzzling fact: there are surprisingly large differences among Boldavians in the incidence of left-handedness by age group. The explanation of this fact is what is at issue in the question. The passage itself rules out two possible lines of explanation.
The Correct Answer:
A If Boldavian men have a shorter average life expectancy than Boldavian women do, it is plausible, as one goes from one age group to the next, in ascending order of age, that a smaller proportion of people in each successive age group are men. This would mean that any quality—such as left-handedness, or being more than 6 feet tall—that is more common among men than it is among women would be less prevalent in successively older age groups. (A) says that Boldavian men live less long, on average, than Boldavian women and also says that left-handedness is more common among men. (A) therefore helps to explain the observed variation, by age, of left-handedness among Boldavians.
The Incorrect Answer Choices:
B If it were true that left-handed Boldavians were more likely than right-handed ones to be the victims of fatal accidents, then accidents could very well have the effect, over time, of increasing the proportion of right-handers in the population. But (B) says that there is no difference between left-handed and right-handed people in terms of how likely they are to be involved in accidents. So (B) does nothing to help explain the age-related variation in left-handedness among Boldavians.
C (C) might give rise to a tendency for Boldavians who are not strongly right-handed or left-handed to declare themselves ambidextrous. But even if there were such a tendency, it would not explain the variation in incidence of left-handedness by age group.
D A decreasing birthrate affects population size and relative numerical strength of age groups. But with nothing further having been said, a decrease in the birthrate has no implications for the distribution of specific characteristics, such as left-handedness, within an age group. Therefore, (D) by itself does not help explain the variation in incidence of left-handedness by age group.
E This statement suggests that the proportion of left-handed people in the overall population of Boldavia may fluctuate somewhat. This may indicate that the disparities in left-handedness across age groups are not necessarily constant. But this does not help explain why those sorts of disparities exist in the first place.
