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A is the only one that fits.
No information is provided about incorrectly addressed mails and that leaves out B and D.
correctly addressed mail (A) ==> arrives within 2 business days (B)
C inverses this relationship (B ==> A) and so is wrong.
E is irrelevent.
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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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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; - if incorrectly adressed, delay is due to incorrect adress. 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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Even i agree that answer should be A. Experts pls advise. Thanks in advance 
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Thanks for the explanation hypermeganet. Clears the confusion.
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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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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;
- if incorrectly adressed, delay is due to incorrect adress.
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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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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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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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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I agree with D.
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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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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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