Asthma, hay fever

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anan0007: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Tue Feb 08, 2011 4:17 am

by anan0007 » Tue Feb 08, 2011 6:49 am

Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.
Fact: Over 95 percent of people who have asthma also suffer from hay fever.

If the information given as facts above is true, which of the following must also be true?
A.Hay fever is a prerequisite for the development of asthma.
B.Asthma is a prerequisite for the development of hay fever.
C.Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.
D.The number of people who have both of these ailments is greater than the number of people who have only one of them.
E.The percentage of people suffering from hay fever who also have asthma is lower than 95 percent

OA:E. Could someone tell me how to deal with this question?

Source: Beat The GMAT — Critical Reasoning | Tue Feb 08, 2011 6:49 am

mundasingh123: Legendary Member; Posts: 2330; Joined: Fri Jan 15, 2010 5:14 amFollowed by: 26 members; Thanked: 56 times

by mundasingh123 » Tue Feb 08, 2011 6:51 am

anan0007 wrote:Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.
Fact: Over 95 percent of people who have asthma also suffer from hay fever.

If the information given as facts above is true, which of the following must also be true?
A.Hay fever is a prerequisite for the development of asthma.
B.Asthma is a prerequisite for the development of hay fever.
C.Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.
D.The number of people who have both of these ailments is greater than the number of people who have only one of them.
E.The percentage of people suffering from hay fever who also have asthma is lower than 95 percent

OA:E. Could someone tell me how to deal with this question?

Hi can u pls reveal the source ?

I Seek Explanations Not Answers

fitzgerald23: Master | Next Rank: 500 Posts; Posts: 219; Joined: Mon Mar 08, 2010 8:51 pmFollowed by: 5 members; Thanked: 62 times; GMAT Score:750

by fitzgerald23 » Tue Feb 08, 2011 9:06 am

This is a question that you can approach like a Quant questions.

Condition 1: Asthma is less common than hay fever. A < H

Condition 2: 95 percent of people who have asthma also have hay fever. 0.95A = A+H

A & B. Incorrect. There is nothing here that talks about the two diseases causing the other one.

C. Incorrect. We dont have any information on the total population. Maybe everyone in the population has hay fever. Maybe they do not.

D. Incorrect. Just simply look at the numbers above and you will see that this is not true. You can simply plug in numbers to prove this is wrong. If 100 people have asthma and 1000 have hay fever it means 95 have both and 910 have hay fever.

E. Correct. (H+A)/H = 0.95A/(>A) is always going to be less than 95 percent.

VivianKerr: GMAT Instructor; Posts: 1035; Joined: Fri Dec 17, 2010 11:13 amFollowed by: 365 members; Location: Los Angeles, CA; Thanked: 474 times

by VivianKerr » Tue Feb 08, 2011 12:54 pm

FACTS: Hay Fever is more common than Asthma; 95% of asthma sufferers have hay fever.

Let's say 100 people suffer from Asthma. 95 of them also have hay fever. Since hay fever is more common, there must be more than 5% of people who suffer from hay fever only.

For E, if this was true out of 100 people who have hay fever, 95% of those have asthma as well; 95 people have both, and only 5% would only have asthma. This contradicts our interpretation of the facts. We need MORE than 5% to suffer from hay fever only.

Vivian Kerr
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aru1: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Mon Jan 17, 2011 9:48 am

by aru1 » Tue Feb 08, 2011 3:13 pm

Yes, much similar to quant question.

anan0007: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Tue Feb 08, 2011 4:17 am

by anan0007 » Tue Feb 08, 2011 4:44 pm

mundasingh123 wrote:
anan0007 wrote:Fact: Asthma, a bronchial condition, is much less common ailment than hay fever, an allergic inflammation of the nasal passages.
Fact: Over 95 percent of people who have asthma also suffer from hay fever.

If the information given as facts above is true, which of the following must also be true?
A.Hay fever is a prerequisite for the development of asthma.
B.Asthma is a prerequisite for the development of hay fever.
C.Those who have neither hay fever nor asthma comprise less than 5 percent of the total population.
D.The number of people who have both of these ailments is greater than the number of people who have only one of them.
E.The percentage of people suffering from hay fever who also have asthma is lower than 95 percent

OA:E. Could someone tell me how to deal with this question?
Hi can u pls reveal the source ?

Hi,mundasingh123, I just saw this question from another gmat forum and I don't know the exact offical source.

anan0007: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Tue Feb 08, 2011 4:17 am

by anan0007 » Tue Feb 08, 2011 4:50 pm

VivianKerr wrote:FACTS: Hay Fever is more common than Asthma; 95% of asthma sufferers have hay fever.

Let's say 100 people suffer from Asthma. 95 of them also have hay fever. Since hay fever is more common, there must be more than 5% of people who suffer from hay fever only.

For E, if this was true out of 100 people who have hay fever, 95% of those have asthma as well; 95 people have both, and only 5% would only have asthma. This contradicts our interpretation of the facts. We need MORE than 5% to suffer from hay fever only.

Hi,VivianKerr, can we really see a lot of this kind of questions in the gmat test?

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