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## OG CR:Fast-food restaurants make up

tagged by: NandishSS

This topic has 2 expert replies and 2 member replies
NandishSS Master | Next Rank: 500 Posts
Joined
05 Jun 2015
Posted:
301 messages
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#### OG CR:Fast-food restaurants make up

Sat Sep 17, 2016 9:27 pm
Fast-food restaurants make up 45 percent of all restaurants in Cantaria. Customers at these restaurants tend to be young; in fact, studies have shown that the older people get, the less likely they are to eat in fast-food restaurants. Since the average age of the Canatrian population is gradually rising and will continue to do so, the number of fast-food restaurants is likely to decrease.

Which of the following, if true, most seriously weakens the argument?

A) Fast-food restaurants in Canatria are getting bigger, so each one can serve more customers.
B) Some older people eat at fast-food restaurants more frequently than the average young person.
C) Many people who rarely eat in fast-food restaurants nevertheless eat regularly in restaurants.
D) The overall population of Canatria is growing steadily.
E) As the population of Canatria gets older, more people are eating at home.

OA:D

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### GMAT/MBA Expert

GMATGuruNY GMAT Instructor
Joined
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Posted:
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GMAT Score:
790
Tue Sep 20, 2016 6:59 am
ritzzzr wrote:
GMATGuruNY wrote:
NandishSS wrote:
Fast-food restaurants make up 45 percent of all restaurants in Cantaria. Customers at these restaurants tend to be young; in fact, studies have shown that the older people get, the less likely they are to eat in fast-food restaurants. Since the average age of the Canatrian population is gradually rising and will continue to do so, the number of fast-food restaurants is likely to decrease.

Which of the following, if true, most seriously weakens the argument?

A) Fast-food restaurants in Canatria are getting bigger, so each one can serve more customers.
B) Some older people eat at fast-food restaurants more frequently than the average young person.
C) Many people who rarely eat in fast-food restaurants nevertheless eat regularly in restaurants.
D) The overall population of Canatria is growing steadily.
E) As the population of Canatria gets older, more people are eating at home.

OA:D
Premise: The average age of the Canatrian population is gradually rising, and studies have shown that the older people get, the less likely they are to eat in fast-food restaurant.
Conclusion: The number of fast-food restaurants is likely to decrease.

One assumption is that AVERAGE = NUMBER.

Consider the following case:
Now: 60 20-year old citizens and 40 50-year old citizens, total population = 100, average age = (60*20 + 40*50)/100 = 32.
Five years from now: 400 20-year old citizens and 600 50-year old citizens, total population = 1000, average age = (400*20 + 600*50)/1000 = 38.

Here, the average age increases from 32 to 38, but the number of young people INCREASES from 60 to 400, WEAKENING the conclusion that the number of fast food restaurants catering to young people will decrease.

Hi ,
Its a bit unclear to me can you explain it a bit more?
The argument assumes that an increase in the average age will lead to a decrease in the number of young people frequenting fast-food restaurants.

In the case in blue:
The total population increases from 100 to 1000.
The average age increases from 32 to 38.
The total number of young people increases from 60 to 400.

This case illustrates that an increase in the total population can yield both an increase in the average age AND an increase in the total number of young people.
Thus, the OA attacks the assumption that an increase in the average age will lead to a decrease in the number of young people frequenting fast-food restaurants, thereby weakening the conclusion that the number of fast-food restaurants is likely to decline.

_________________
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GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "Thank" icon.
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MBA Challengers Senior | Next Rank: 100 Posts
Joined
09 Sep 2016
Posted:
51 messages
20
Tue Sep 20, 2016 4:11 am

1. FF restaurants - 45% of restaurants in Cantaria
2. The older people get, lesser likely they are to eat in FF restaurants
3. Younger people eat at FF restaurants
4. Avg age of Cantarian population is rising and continuing trend

Conclusion - Number of fast food restaurants will decrease
Assumption - 1. Number of customers interested in eating at a FF restaurant will reduce
2. Number of younger people in Cantaria will reduce

Now going through the options:
A. This only strengthens the conclusion because if they are able to cater to more people, more cost but the pool of people might fall.
B. This is not directly tackling the problem of lesser people to eat at restaurants. Some exceptions will not reverse a possible trend.
C. The conclusion clearly mentions decrease in number of FF restaurants. Doesn't count.
D. Consider this: If the overall population increases, even if the average age is higher, the proportion of younger people might fall but the absolute number is likely to increase. So, in country Hakuna Matata, if there were earlier 100 people with average age 45, even if the average age increases to 55 but the overall population increases to 1000 the number of younger people would have increased. So, this is a possible situation which weakens the author's argument.
E. This only further strengthens the argument.

So, the answer should be D

_________________
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### GMAT/MBA Expert

GMATGuruNY GMAT Instructor
Joined
25 May 2010
Posted:
13607 messages
Followed by:
1796 members
13060
GMAT Score:
790
Tue Sep 20, 2016 6:59 am
ritzzzr wrote:
GMATGuruNY wrote:
NandishSS wrote:
Fast-food restaurants make up 45 percent of all restaurants in Cantaria. Customers at these restaurants tend to be young; in fact, studies have shown that the older people get, the less likely they are to eat in fast-food restaurants. Since the average age of the Canatrian population is gradually rising and will continue to do so, the number of fast-food restaurants is likely to decrease.

Which of the following, if true, most seriously weakens the argument?

A) Fast-food restaurants in Canatria are getting bigger, so each one can serve more customers.
B) Some older people eat at fast-food restaurants more frequently than the average young person.
C) Many people who rarely eat in fast-food restaurants nevertheless eat regularly in restaurants.
D) The overall population of Canatria is growing steadily.
E) As the population of Canatria gets older, more people are eating at home.

OA:D
Premise: The average age of the Canatrian population is gradually rising, and studies have shown that the older people get, the less likely they are to eat in fast-food restaurant.
Conclusion: The number of fast-food restaurants is likely to decrease.

One assumption is that AVERAGE = NUMBER.

Consider the following case:
Now: 60 20-year old citizens and 40 50-year old citizens, total population = 100, average age = (60*20 + 40*50)/100 = 32.
Five years from now: 400 20-year old citizens and 600 50-year old citizens, total population = 1000, average age = (400*20 + 600*50)/1000 = 38.

Here, the average age increases from 32 to 38, but the number of young people INCREASES from 60 to 400, WEAKENING the conclusion that the number of fast food restaurants catering to young people will decrease.

Hi ,
Its a bit unclear to me can you explain it a bit more?
The argument assumes that an increase in the average age will lead to a decrease in the number of young people frequenting fast-food restaurants.

In the case in blue:
The total population increases from 100 to 1000.
The average age increases from 32 to 38.
The total number of young people increases from 60 to 400.

This case illustrates that an increase in the total population can yield both an increase in the average age AND an increase in the total number of young people.
Thus, the OA attacks the assumption that an increase in the average age will lead to a decrease in the number of young people frequenting fast-food restaurants, thereby weakening the conclusion that the number of fast-food restaurants is likely to decline.

_________________
Mitch Hunt
GMAT Private Tutor
GMATGuruNY@gmail.com
If you find one of my posts helpful, please take a moment to click on the "Thank" icon.
Available for tutoring in NYC and long-distance.

Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now.
MBA Challengers Senior | Next Rank: 100 Posts
Joined
09 Sep 2016
Posted:
51 messages
20
Tue Sep 20, 2016 4:11 am

1. FF restaurants - 45% of restaurants in Cantaria
2. The older people get, lesser likely they are to eat in FF restaurants
3. Younger people eat at FF restaurants
4. Avg age of Cantarian population is rising and continuing trend

Conclusion - Number of fast food restaurants will decrease
Assumption - 1. Number of customers interested in eating at a FF restaurant will reduce
2. Number of younger people in Cantaria will reduce

Now going through the options:
A. This only strengthens the conclusion because if they are able to cater to more people, more cost but the pool of people might fall.
B. This is not directly tackling the problem of lesser people to eat at restaurants. Some exceptions will not reverse a possible trend.
C. The conclusion clearly mentions decrease in number of FF restaurants. Doesn't count.
D. Consider this: If the overall population increases, even if the average age is higher, the proportion of younger people might fall but the absolute number is likely to increase. So, in country Hakuna Matata, if there were earlier 100 people with average age 45, even if the average age increases to 55 but the overall population increases to 1000 the number of younger people would have increased. So, this is a possible situation which weakens the author's argument.
E. This only further strengthens the argument.

So, the answer should be D

_________________
Log on to www.mbachallengers.com for
Easy strategic GMAT prep
For any queries mail us at mba.challengers@outlook.com

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