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# Nearly all mail that is correctly addressed arrives at its

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23 Jun 2010, 18:18
A is the only one that fits.

No information is provided about incorrectly addressed mails and that leaves out B and D.

C inverses this relationship (B ==> A) and so is wrong.

E is irrelevent.
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23 Jun 2010, 22:37
hypermeganet wrote:
I will try and do my best to answer this one again. Since this is LSAT logic it is really far more advanced than anything you'll see on the GMAT. I'm getting -0 CR on my GMAT practices and this problem is probably 10 times harder than anything I've seen in GMAT prep.

Let's break down the stimulus:

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

If mail is correctly addressed then it arrives within 2 days.
If mail does not arrive within 2 days it is not correctly addressed.

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

If correctly addressed mail does not arrive within 2 days then it is damaged.

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?

So we know that if mail is correctly addressed it arrives within 2 days unless it is damaged. We also know that nearly ALL correctly addressed mail arrives within 2 days, meaning that most correctly addressed mail is NOT damaged.

How else can we account for the fact that mail takes longer than 2 days? It must be incorrectly addressed. D.

So, why is C wrong?

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

This is what is called a mistaken reversal.

If mail is correctly addressed then it arrives within 2 days, per above. This does NOT mean that if a letter arrives within two days it is correctly addressed! That is a key point. The stimulus says the only way mail CAN TAKE LONGER is for it to be damaged or incorrectly addressed. This does not mean that incorrectly addressed mail MUST take longer than two days. For all we know 100 letters are delivered, 99 of which are incorrectly addressed. 19 of these letters arrive within 2 days and 81 arrive after 2 days. Only one of these is correctly addressed but the majority take 3+ days.

Hey!!!
The conclusion that you taking out of that sentence above highlighted in red is incorrect.
I am not sure what the OA is but you ar surely missing something over there.

It says ' all the mail that is correctly addressed' and this in no way means 'nearly ALL correctly addressed mail arrives within 2 days' as understood by you.

????
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07 Jul 2010, 03:09
my ans was С, but it is wrong.

D is correct- reasoning is:

Statements:
- normally correctly adressed letter arrives in 2 days
-correctly addressed mail takes longer than this only when it is damaged in transit.
- Reallity: Overall, however, most mail arrives three business days or more after being sent

Delyas may be due to:
-if correctly adressed, delay is due to damage;

Reality is : most mail arrives three business days or more.
Two variants are:
-most are correcly adresesed few are damaged, thus delay - so in average 3 days.
-most are incorrectly adressed, few/any are damaged - so avearage is 3 days.

A) A large proportion of the mail that is correctly addressed is damaged in transit.
what if mails are incorrectly adressed and damaged? - may be false may be true.

B) No incorrectly addressed mail arrives within two business days of being sent.- we don't know. too strong.

C) Most mail that arrives within two business days of being sent is correctly addressed.
- reversed statement.
D) A large proportion of mail is incorrectly addressed. -supported by stimuli. (yes, even if it is not logical, this is GMAT world!)

E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent. - we don't know since we do not have any figures here or other numerical clues.
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09 Jul 2010, 01:37

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09 Jul 2010, 03:40
Thanks for the explanation hypermeganet.
Clears the confusion.
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20 Aug 2011, 16:18
Sorry guys but if the conclusion clearly says "Overall, however, most mail arrives three business days or more after being sent"

the only answer is D......for sure
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10 Oct 2011, 22:15
PTK wrote:
my ans was С, but it is wrong.

D is correct- reasoning is:

Statements:
- normally correctly adressed letter arrives in 2 days
-correctly addressed mail takes longer than this only when it is damaged in transit.
- Reallity: Overall, however, most mail arrives three business days or more after being sent

Delyas may be due to:
-if correctly adressed, delay is due to damage;

Reality is : most mail arrives three business days or more.
Two variants are:
-most are correcly adresesed few are damaged, thus delay - so in average 3 days.
-most are incorrectly adressed, few/any are damaged - so avearage is 3 days.
- can you explain this logic. As per my understanding, even if most are damaged and few are correctly addressed, the average could be 3 days. Here you are assuming that if the mail is damaged it will take way more than 3 days so there has to be more mail which is correctly addressed to pull to average down to 3 days - I can not derive this assumption from stimulus.

A) A large proportion of the mail that is correctly addressed is damaged in transit.
what if mails are incorrectly adressed and damaged? - may be false may be true.

B) No incorrectly addressed mail arrives within two business days of being sent.- we don't know. too strong.

C) Most mail that arrives within two business days of being sent is correctly addressed.
- reversed statement.
D) A large proportion of mail is incorrectly addressed. -supported by stimuli. (yes, even if it is not logical, this is GMAT world!)

E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent. - we don't know since we do not have any figures here or other numerical clues.

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11 Oct 2011, 02:10
hitman4683v1 wrote:
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. 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.

Based on the given facts, I think A is the right option here.
There is nothing being said about the mails, which are addressed incorrectly. B and D are out.
C has the same problem, unless we dont know what happens to the incorrectly addressed mail, we can not be sure of this statement.
E clearly is false, as if this was true Overall most of the mail would have taken 2 to 3 days.

A is the only choice left and looks like a valid conclusion.
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11 Oct 2011, 03:15
hitman4683v1 wrote:
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. 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.

This is a weighted average question in disguise. Good explanations above. thanks
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11 Oct 2011, 03:43
fluke wrote:
hitman4683v1 wrote:
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. 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.

This is a weighted average question in disguise. Good explanations above. thanks

Fluke, what is your take on this?
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11 Oct 2011, 04:26
I agree with D.
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11 Oct 2011, 04:59
hitman4683v1 wrote:
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. 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.

We know correctly addressed mails arrive within 2 days.
We know that overall arrival time of all mails is equal to or greater than 3 days.

Means what; the weight of the mails that arrived beyond 3 days IS greater than the weight of the mails that arrived within 2 days. And, what kind of mails arrive beyond 3 days. Incorrectly Addressed OR Correctly addressed but damaged in transit. Now, we need to make subtle assumption here. Correctly addressed but damaged in transit WILL not be that many because "NEARLY ALL mail that is correctly addressed arrives at its destination within two business days", i.e. there are very few- perhaps negligible- that are damaged. Also, this number will ALSO be neutralized by the number of mails that are incorrectly written but arrive within 2 days.

Seeing all this "D" seems to be the best.

A) A large proportion of the mail that is correctly addressed is damaged in transit.
This directly refutes the premise. "NEARLY ALL mail that is correctly addressed arrives at its destination within two business days"

B) No incorrectly addressed mail arrives within two business days of being sent.
Nothing of this sort is mentioned. There can be few mails that were incorrectly written but were delivered on time. We just know that if a mail arrived beyond 2 days, it was either incorrectly addressed OR damaged.

C) Most mail that arrives within two business days of being sent is correctly addressed.
Now, this seems plausible but may not be true.

It can happen like this:
100- Correctly written: Arrived within 2 days.
1000- Incorrectly Written: Arrived within 2 days.

But,
(1100+x): x is some number, Incorrectly addressed mail will have to arrive beyond 3 days.

E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent.
We can't be sure of this one too.

100- Correctly written - arrived within 2 days
5-Incorrectly written OR Damaged- arrived between 2 and 3 days
>105 incorrectly written arrived beyond 3 days.

Ans: "D"
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11 Oct 2011, 12:10
fluke wrote:
hitman4683v1 wrote:
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. 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.

We know correctly addressed mails arrive within 2 days.
We know that overall arrival time of all mails is equal to or greater than 3 days.

Means what; the weight of the mails that arrived beyond 3 days IS greater than the weight of the mails that arrived within 2 days. And, what kind of mails arrive beyond 3 days. Incorrectly Addressed OR Correctly addressed but damaged in transit. Now, we need to make subtle assumption here. Correctly addressed but damaged in transit WILL not be that many because "NEARLY ALL mail that is correctly addressed arrives at its destination within two business days", i.e. there are very few- perhaps negligible- that are damaged. Also, this number will ALSO be neutralized by the number of mails that are incorrectly written but arrive within 2 days.

Seeing all this "D" seems to be the best.

A) A large proportion of the mail that is correctly addressed is damaged in transit.
This directly refutes the premise. "NEARLY ALL mail that is correctly addressed arrives at its destination within two business days"

B) No incorrectly addressed mail arrives within two business days of being sent.
Nothing of this sort is mentioned. There can be few mails that were incorrectly written but were delivered on time. We just know that if a mail arrived beyond 2 days, it was either incorrectly addressed OR damaged.

C) Most mail that arrives within two business days of being sent is correctly addressed.
Now, this seems plausible but may not be true.

It can happen like this:
100- Correctly written: Arrived within 2 days.
1000- Incorrectly Written: Arrived within 2 days.

But,
(1100+x): x is some number, Incorrectly addressed mail will have to arrive beyond 3 days.

E) More mail arrives within two business days of being sent than arrives between two and three business days after being sent.
We can't be sure of this one too.

100- Correctly written - arrived within 2 days
5-Incorrectly written OR Damaged- arrived between 2 and 3 days
>105 incorrectly written arrived beyond 3 days.

Ans: "D"

Fluke, mate, how do you know that the mails which are incorrectly addressed take more than 3 days ? It is not mentioned in the argument.
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Re: Nearly all mail that is correctly addressed arrives at its [#permalink]

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27 Nov 2014, 23:24
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27 Jul 2015, 09:55
BM wrote:
I chose the wrong answer on this one. But I now see why the answer is D.

CA mail consists of two groups: (1) damaged and (2) not damaged mail. At any rate, nearly all of the CA mail arrives at its destination within 2 days. However, Since most of the mail takes longer, it must be the case that the it is not addressed correctly.

So, is it the case that 'All mails' is the Super-set here and the 'correctly addressed mails' is a subset of it? And, the Must be true part focuses on the super-set related premise, i.e.
Overall, however, most mail arrives three business days or more after being sent.
making

A large proportion of mail is incorrectly addressed

Since most mails arrive in 3 business days or more, we can conclude that they are incorrectly addressed (based on the earlier premise.)

Please correct me if there is any gap in my understanding.
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Re: Nearly all mail that is correctly addressed arrives at its [#permalink]

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05 Aug 2015, 04:43
hypermeganet wrote:
I will try and do my best to answer this one again. Since this is LSAT logic it is really far more advanced than anything you'll see on the GMAT. I'm getting -0 CR on my GMAT practices and this problem is probably 10 times harder than anything I've seen in GMAT prep.

Let's break down the stimulus:

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

If mail is correctly addressed then it arrives within 2 days.
If mail does not arrive within 2 days it is not correctly addressed.

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

If correctly addressed mail does not arrive within 2 days then it is damaged.

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?

So we know that if mail is correctly addressed it arrives within 2 days unless it is damaged. We also know that nearly ALL correctly addressed mail arrives within 2 days, meaning that most correctly addressed mail is NOT damaged.

How else can we account for the fact that mail takes longer than 2 days? It must be incorrectly addressed. D.

So, why is C wrong?

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

This is what is called a mistaken reversal.

If mail is correctly addressed then it arrives within 2 days, per above. This does NOT mean that if a letter arrives within two days it is correctly addressed! That is a key point. The stimulus says the only way mail CAN TAKE LONGER is for it to be damaged or incorrectly addressed. This does not mean that incorrectly addressed mail MUST take longer than two days. For all we know 100 letters are delivered, 99 of which are incorrectly addressed. 19 of these letters arrive within 2 days and 81 arrive after 2 days. Only one of these is correctly addressed but the majority take 3+ days.

Amazing explanation and use of logic!
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Re: Nearly all mail that is correctly addressed arrives at its [#permalink]

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10 Jun 2016, 06:34
What am I missing here?

This is a "Must Be True question" without a conclusion ; hence it must be a Inference question.
The fact that it is a inference question is further bolstered by the the stimulus which is a collection of factual statements about mail delivery and time taken .
No conclusion is presented in the stimulus. So definitely an Inference question.

The answer to an Inference question is always a Re-packaged Premise. (According to Powerscore LSAT teachers, whom I regard in high esteem)

So the premises are
Premise 1) Nearly all correct mail takes 2 days ("Nearly all" means "not all" or at least one mail takes more than 2 days )
Premise 2) Correct mails takes more than 2 days when it is damaged in transit
Premise 3) However most mail arrives in 3 days or more, after being send.
Conclusion :- NOT PRESENTED IN THE STIMULUS

How can answer D be correct "A large proportion of mail is incorrectly addressed"

It certainly look like an unstated premise. Isn't an understated premise also called an assumption ?
If we move forward with the logic and complete the breakdown :-
Premise 1) Nearly all correct mail takes 2 days ("Nearly all" means "not all" or at least one mail takes more than 2 days )
Premise 2) Correct mails takes more than 2 days when it is damaged in transit
Premise 3) Incorrect mail takes 3 or more days to arrive. (ASSUMPTIONS)
Premise 4) However most mail arrives in 3 days or more, after being send.
Conclusion :- Therefore we can conclude, a majority of mail is wrongly addressed.

Nothing explicit is said about incorrectly addressed mail in the question stem.
So we cannot bring new information to answer the question ?
option D is new information

So again, What am I missing ????

AN EXPLAINATON WOULD BE MUCH APPRECIATED
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Re: Nearly all mail that is correctly addressed arrives at its [#permalink]

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10 Jun 2016, 08:48
hitman4683v1 wrote:
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. 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.

My Views--

IMO A is the right answer.

Now,in argument in states that most mails arrive in three days or more and that correctly addressed mails arrive in more than two days only when it is damaged in transit.Thus,it can be clearly concluded large proportion==most mail that is correctly addressed is damaged in transit and thus takes three or more days.

Kindly note in Inference type of questions we can only use the information provided in the argument.No outside information can be used.
Re: Nearly all mail that is correctly addressed arrives at its   [#permalink] 10 Jun 2016, 08:48

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