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# Normally it takes a week for a cake to become moldy in a refrigerator.

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Math Expert
Joined: 02 Sep 2009
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Normally it takes a week for a cake to become moldy in a refrigerator.  [#permalink]

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21 Jan 2019, 03:53
2
2
00:00

Difficulty:

45% (medium)

Question Stats:

61% (01:22) correct 39% (01:26) wrong based on 168 sessions

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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?

A. Alex's refrigerator has not been cleaned in two years.

B. A blown fuse in Alex's building has deprived his refrigerator of electricity for the past five days.

C. The cake had just been baked when it was placed in Alex's refrigerator; it has remained there ever since.

D. A recent study demonstrated that 95% of refrigerators currently in use will keep a cake fresh for one week.

E. The cake was baked on a Tuesday.

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Re: Normally it takes a week for a cake to become moldy in a refrigerator.  [#permalink]

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21 Jan 2019, 05:00
First of all WHAT IS MOLDY!!!!!What does the question say!!!!!What do the options say!!!!How are they even related!!!!!

I am tending towards D but whatever...

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Re: Normally it takes a week for a cake to become moldy in a refrigerator.  [#permalink]

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21 Jan 2019, 09:06
Bunuel wrote:
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?

A. Alex's refrigerator has not been cleaned in two years.

B. A blown fuse in Alex's building has deprived his refrigerator of electricity for the past five days.

C. The cake had just been baked when it was placed in Alex's refrigerator; it has remained there ever since.

D. A recent study demonstrated that 95% of refrigerators currently in use will keep a cake fresh for one week.

E. The cake was baked on a Tuesday.

Clearly D stands out over other options ;
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Re: Normally it takes a week for a cake to become moldy in a refrigerator.  [#permalink]

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22 Jan 2019, 12:20
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This is Strengthen question, So we have to focus on the conclusion only, which is " the cake in Alex's refrigerator must be at least a week old"

Prethinking: What if the cake was placed in someone's else refrigerator for 3 days and then place in Alex's for last 2 days, in that case, it would destroy the conclusion

A. Alex's refrigerator has not been cleaned in two years.

B. A blown fuse in Alex's building has deprived his refrigerator of electricity for the past five days.

C. The cake had just been baked when it was placed in Alex's refrigerator; it has remained there ever since.: PRETHINKING

D. A recent study demonstrated that 95% of refrigerators currently in use will keep a cake fresh for one week.

E. The cake was baked on a Tuesday.
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Re: Normally it takes a week for a cake to become moldy in a refrigerator.  [#permalink]

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04 Feb 2019, 16:46
My take on why D is incorrect:

Conclusion has the word "must". So the correct option should say that in any case (100% of all times), the cake has been in the refrigerator for atleast a week.

Option D says 95% refrigerators can keep a cake fresh for a week. This means 5% refrigerators fail to keep a cake fresh for a week. This 5% does not bode well with the "must" condition and hence Option D is incorrect.
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Re: Normally it takes a week for a cake to become moldy in a refrigerator.   [#permalink] 04 Feb 2019, 16:46
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