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Mail delivery - A Must Be True question from Kaplan

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Mail delivery - A Must Be True question from Kaplan [#permalink] New post 19 Dec 2009, 22:17
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10% (02:51) correct 90% (01:36) wrong based on 10 sessions
Hello everyone, this is a question from Kaplan test. I've already read the explanation but still didn't get it clearly:

Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit, which is very rare. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?

A) A large proportion of the mail that is correctly addressed is damaged in transit.

B) No incorrectly addressed mail arrives within two business days of being sent.

C) Most mail that arrives within two business days of being sent is correctly addressed.

D) A large proportion of mail is incorrectly addressed.

E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent.
--
Thanks in advance ;)
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 20 Dec 2009, 08:34
I think correct answer is A.
Reason: Since it is already stated in argument that most mail arrives three business days or more after being sent, so this means that the mail is correctly addressed but damaged in transit.

B: Already stated in sentence.
C: Already stated in sentence.
D: Nothing is said in abt incorrect address
E: This must be false as most mails arrives within three business day.

What is OA?
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 20 Dec 2009, 10:58
D....
A is out as it is written that damaging is very rare so only possibility is that mails are incorrectly addsd
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 20 Dec 2009, 12:00
This is how I diagrammed the question

MCA = mail correctly addressed
<=2 ----> arrives withing two business days
>2 ----> arrives longer than two business days
DT = damage in transit
M = mail

Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent.

(1) MCA ---m-----> <=2

In fact, correctly addressed mail takes longer than this only when it is damaged in transit, which is very rare.

(2) MCA and >2 -----> DT

Overall, however, most mail arrives three business days or more after being sent.

(3) M ---> m ----> >2

So the chain that we have is the following

(1) MCA --------> <=2
(2) MCA and >2 -----> DT
(3) M ---> m ----> >2

using that A ----> B equals not B ---> not A you can transform (1) into

(4) not <=2 -----> not MCA meaning if a package arrives three business days or more after being sent, it is not correctly addressed

(5) so >2 -----> not MCA

using (3) and (5) you get

(3) M ---> m ----> >2
(4) >2 -----> not MCA so you can infer that

M ---m----> not MCA that is exactly D

if you want to think about the problem not diagramming it.

Imagine that you have 10 packages to be sent. You know that most of those packages will arrive 3 or more days after being sent. Let's say that 7 of those packages arrive 3 or more days after being sent. What you know is that those packages are not correctly addressed because if they were they would have arrived withing 2 days. Thus most packages are not correctly addressed.

Let me know if this helps.
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 20 Dec 2009, 17:07
Easy one D. E comes close but it has too many variables -
1) How many envelopes are correctly addressed? Unknown - These take less than 2 days
2) How many envelopes are damaged? Very few - These take more than 2 days.
3) How many envelopes are incorrectly addressed? Lots - These could take any amount of time <2 days 2-3 days or >3 days but a majority take >3 days.

So we don't know how many mails arrive <2 days and how many arrive >2 but < 3 days.

Answer choice D can directly be inferred from Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent(exception of a few damaged ones).
Overall, however, most mail arrives three business days or more after being sent. (These can only be incorrectly addressed ones.)
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 20 Dec 2009, 19:40
Thank you all!! Aha, now I can see why D is the only correct answer. At first I chose C because I think that: only incorrectly addressed and damaged in transit mails are late, so most early delivered mails must be correctly addressed. Now I see why it is wrong thinking that way. :)
As C looks so attractive to me, if possible, can you give me some more ideas or general conception to avoid such wrong answer choices next time?
Thanks a bunch :wink:
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 24 Dec 2009, 09:09
Nearly all mail that is correctly addressed arrives at its destination within two business days of being sent. In fact, correctly addressed mail takes longer than this only when it is damaged in transit, which is very rare. Overall, however, most mail arrives three business days or more after being sent. If the statements above are true, which one of the following must be true?

A) A large proportion of the mail that is correctly addressed is damaged in transit. it is very rare as stated in the stimilus

B) No incorrectly addressed mail arrives within two business days of being sent. Too extreme, the stimulus says nearly all

C) Most mail that arrives within two business days of being sent is correctly addressed. it's a premise already stated in the stimulus (1st sentence)

D) A large proportion of mail is incorrectly addressed. The correct answer, if most mail arrives in three business days or more, although it is very rare that the mail is damaged in transit, we can conclude from the stimulus a large proportion of mail is incorrectly addressed

E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent. Contradict the stimulus which states that most arrive in three business days or more

This question is not really difficult because it was possible to prephrase the correct answer without to read the answers
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 24 Dec 2009, 21:33
Either it's damaged or it's incorrectly addressed

but damage is very rare.

therefore D
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 26 Dec 2009, 01:14
Yes as given in the question 'Damaged mail is very rare' hence option 'D' has to be the answer.
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 18 Feb 2011, 01:45
Ans D).

Diagramming is the key here...The best way, in my opinion, is to diagram these types of questions. The answer choice will almost always be a logical negation of one of the diagramed equations as one poster explained.

Thanks,
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Re: Mail delivery - A Must Be True question from Kaplan [#permalink] New post 18 Feb 2011, 17:49
vineet474 wrote:
Ans D).

Diagramming is the key here...The best way, in my opinion, is to diagram these types of questions. The answer choice will almost always be a logical negation of one of the diagramed equations as one poster explained.

Thanks,
-V


can you share your diagram with us, i got this wrong, went for (C)
Re: Mail delivery - A Must Be True question from Kaplan   [#permalink] 18 Feb 2011, 17:49
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