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bipolarbear
Joined: 11 Dec 2008
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Schools: HBS '15 (D) Stanford '15 (WL) Wharton '15 (WL)
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20 Aug 2009, 08:29
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From MGMAT:
Normally it takes a week for a cake to become moldy in a refrigerator. The cake in Alex's refrigerator is moldy. Therefore, the cake in Alex's refrigerator must be at least a week old.
Which of the following, if true, strengthens the conclusion?
Alex's refrigerator has not been cleaned in two years.
A blown fuse in Alex's building has deprived his refrigerator of electricity for the past five days.
The cake had just been baked when it was placed in Alex's refrigerator; it has remained there ever since.
A recent study demonstrated that 95% of refrigerators currently in use will keep a cake fresh for one week.
The cake was baked on a Tuesday.
Normally it takes a week for a cake to become moldy in a refrigerator. The cake in Alex's refrigerator is moldy. Therefore, the cake in Alex's refrigerator must be at least a week old.
Which of the following, if true, strengthens the conclusion?
Alex's refrigerator has not been cleaned in two years.
A blown fuse in Alex's building has deprived his refrigerator of electricity for the past five days.
The cake had just been baked when it was placed in Alex's refrigerator; it has remained there ever since.
A recent study demonstrated that 95% of refrigerators currently in use will keep a cake fresh for one week.
The cake was baked on a Tuesday.
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20 Aug 2009, 09:17
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bipolarbear
D. A is extra info not needed. B we dont know when the cake was there. C we dont know the days it has been in there. E gives us a starting day but we dont know current day
bipolarbear
Joined: 11 Dec 2008
Last visit: 16 Sep 2013
Posts: 353
Given Kudos: 12
Location: United States
Schools: HBS '15 (D) Stanford '15 (WL) Wharton '15 (WL)
GMAT 1: 760 Q49 V44
GPA: 3.9
20 Aug 2009, 10:07
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OA is C
This argument begins with a premise stating that normally it takes a cake a week to become moldy in a refrigerator. The next premise is that this particular cake is moldy. The argument concludes that this particular cake must have been in the refrigerator for at least a week. The conclusion depends on the idea that this cake has been aging normally inside the refrigerator. (If the refrigerator were defective, or the cake were abnormally perishable, the conclusion would be undermined.) To strengthen the conclusion, you should look for a statement that indicates that the cake has indeed been aging inside the refrigerator in the normal fashion.
(A) Weaken. If Alex's refrigerator is dirty, the cake may well have gotten moldy unusually fast - which means the cake could be less than a week old.
(B) Weaken. If a lack of electricity has kept the refrigerator from working, the cake may well have gotten moldy unusually fast -- which means the cake could be less than a week old.
(C) CORRECT. Strengthen. If the cake had not been fresh when it was placed in the refrigerator, or if it had not been in the refrigerator continuously since then, it might have gotten moldy in less than a week. Therefore, knowing that the cake was fresh when it was placed in the refrigerator, and that it has been there ever since, gives us reason to think that the cake has been aging in the refrigerator at a normal rate.
(D) Irrelevant. This study only provides evidence to support the initial premise in the argument, namely, that "normally it takes a week for a cake to become moldy in a refrigerator." This answer choice does not state whether or not Alex's refrigerator is among the 95%; nor do we know anything else about this specific situation.
(E) Irrelevant. The cake may have been baked on a Tuesday -- but was it the most recent Tuesday, or some Tuesday last year?
This argument begins with a premise stating that normally it takes a cake a week to become moldy in a refrigerator. The next premise is that this particular cake is moldy. The argument concludes that this particular cake must have been in the refrigerator for at least a week. The conclusion depends on the idea that this cake has been aging normally inside the refrigerator. (If the refrigerator were defective, or the cake were abnormally perishable, the conclusion would be undermined.) To strengthen the conclusion, you should look for a statement that indicates that the cake has indeed been aging inside the refrigerator in the normal fashion.
(A) Weaken. If Alex's refrigerator is dirty, the cake may well have gotten moldy unusually fast - which means the cake could be less than a week old.
(B) Weaken. If a lack of electricity has kept the refrigerator from working, the cake may well have gotten moldy unusually fast -- which means the cake could be less than a week old.
(C) CORRECT. Strengthen. If the cake had not been fresh when it was placed in the refrigerator, or if it had not been in the refrigerator continuously since then, it might have gotten moldy in less than a week. Therefore, knowing that the cake was fresh when it was placed in the refrigerator, and that it has been there ever since, gives us reason to think that the cake has been aging in the refrigerator at a normal rate.
(D) Irrelevant. This study only provides evidence to support the initial premise in the argument, namely, that "normally it takes a week for a cake to become moldy in a refrigerator." This answer choice does not state whether or not Alex's refrigerator is among the 95%; nor do we know anything else about this specific situation.
(E) Irrelevant. The cake may have been baked on a Tuesday -- but was it the most recent Tuesday, or some Tuesday last year?
