#19 - Nearly all mail that is correctly addressed arrives at

[adriana180]

Hello,
I am going through the explanations above and I am not following what is meant by the following:

"Let's now make whatever immediate inferences we can from each statement. In other words, let's see whether we know anything else from each statement by itself.

MailCorrectly Addressed most -> Arrive in 2 days
from this we know that 1'. MailCorrectly Addressed not most not Arrive in 2 days."

I understand that there is no contrapositive for the first statement because of the word "most". But I do not understand the inference "MailCorrectly Addressed not most not Arrive in 2 days." Is there another way to write this sentence to help me understand what it is trying to say?

[Robert Carroll]

SINCADRIANA2,

That means the following "Most correctly-addressed mail is not such that it does not arrive within 2 days." We could make that less awkward by translating like this: "Only a minority of correctly-addressed mail will take 3 days or longer to arrive." Hope that helps!

Robert Carroll

[Madhura]

I get the numerical explanations, and I was able to work through them on my own. However, I don't see how I would react to such a stimulus, work out the calculations and get the right answer in ~80-100 seconds in a timed test. Any tips on how to get there faster?

[Robert Carroll]

Madhura,

I have three things to say about this:

1. The formal logic in this stimulus is involved, but it really just involves a lot of formal logic elements that are common on the test, so it's definitely the kind of thing you could do more quickly by having more practice on formal logic. We've speculated that formal logic may appear slightly more often on the test in coming administrations because of the disappearance of logic games, so it's a topic you should put a little extra emphasis on. Recognition of formal logic, diagramming of the relations, and finding standard inferences all get better with practice.

2. As a Must Be True question involving formal logic, I would fully expect this question to take longer than average. So 80-100 seconds wouldn't be appropriate here.

3. Following along with the previous point, this question is actually on the more difficult side of all LR questions anyway, so I'd be especially fine taking longer with this. It's #19, and it's definitely hard - probably one of the three hardest questions of the section it's in. So this is definitely the kind of question I want to save time for.

Hope this helps!

Robert Carroll

[Madhura]

Thank you for your reply, Robert. Time management is something I am trying to get better at, especially in LR sections with a greater number of difficult questions.