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Ask Economist GMAT Tutor a question! [#permalink] New post 04 Sep 2013, 07:16
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Hi all,

I wanted to introduce myself and make sure you all know you're welcome to ask our team any questions you'd like -- I can answer any question about the program itself, and if you have an academic question about our course or about the GMAT in general, we have an excellent team of tutors who are happy to help. Our goal is to make sure you know how to get the most out of the program so you can achieve the highest possible score!

Warm regards,

For free GMAT practice questions, follow us @econgmat_qs
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Re: Ask Economist GMAT Tutor a question! [#permalink] New post 26 Sep 2013, 03:35

So I'm going through the Verbal - Critical Reasoning section and I am getting a few of the practice questions wrong.

I'm only about 12% through the Verbal section, but are these questions indicative of the GMAT or are they there to test my logic?


"If you don't study well for the following test, you are sure to fail", said the professor to his students. "Only those of you who study for at least 10 hours have a chance of passing."
Which of the following can best be inferred, based on the professor's statements ?

A. Anyone who studies for more than ten hours has more of a chance of passing the test than those who study for less than ten hours.
B. No amount of hours will suffice to ensure a passing grade.
C. If someone does not want to fail the test, he or she had better study for at least ten hours.
D. Those who don't study for at least 10 hours will surely fail the course.
E. The professor's course is one of the harder courses of that year.

I selected D (which was wrong) and got the following explanation...

“Those who don't study for 10 hours will surely fail the test, but we have no information as to the achievements necessary for passing the course. Therefore, we cannot draw such a conclusion.”

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Re: Ask Economist GMAT Tutor a question! [#permalink] New post 26 Sep 2013, 04:29
Here is another example...

Gases emitted by motor vehicles are harmful to humans. The more such gases are inhaled, the more damage is done to one's respiratory system. When exercising, larger volumes of air pass through the respiratory system.

Which of the following conclusions is most strongly supported by the information above?

A. When exercising near motor vehicles, one should keep the amount of air inhaled to a minimum.
B. Outdoor exercise in an urban area should not be performed during peak hour traffic.
C. Damages caused to the respiratory system are almost impossible to repair.
D. In the near future, emission-free vehicles will be created to prevent air pollution.
E. Vehicles are harmful to humankind.

I selected A and got the following explanation…

“This conclusion contradicts Premise C which states that we breathe more during exercise.”

The correct answer is B…for bullsh*t. What if you’re in a park in a big city? What if you’re walking down an ally? They’re both urban areas.

I'm a bit worried that because this course is adaptive, I wont get to the harder, more proper CR questions down the line.
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Re: Ask Economist GMAT Tutor a question! [#permalink] New post 26 Sep 2013, 14:32
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Hi there

Fair enough questions!

Let's start by saying that the two quesitons are of a basic nature for now and are certainly not considered advanced by any means. No worries - you will get plenty of advanced CR quesitons, perhaps more than you know what to do with :) So I would not worry even a bit. First you need to make sure you get these questions right. And you are only at 12% - you have barely started and even at 12% you have seen quite a bit. We will continue to feed you Inference questions even later so the fact that you did the lesson and did some practice questions does not mean that's it; you will get plenty more on all the topics. That is one of the points of a fully adaptive and integrated program.

Let's start with this question. It is an Inference question. What do we do with such questions?

We break them down into the premises as there is no conclusion in such arguments and WE try to draw a conclusion. We cannot draw assumptions and any steps that the answer choices make from the premises must be SMALL steps and accord in tone (positive, negative, etc). You must be careful of conclusions that go too far and of choosing answers that are premises; we want a conclusion....

You must also look for the BEST answer....

Let's look at the answer choices (did you read the explanations to the other answers?):

A contradicts the last premise because we KNOW from premise C that more exercise means more air inhaled so exercising near a motor vehicle just invites more of that air into our system

C is too much like a new premise- nothing is mentioned about damages to the respiratory system.

D does the same thing as C! New info suddenly about developments in emission free vehicles? No thanks.

E goes way beyond what is needed. All vehicles emit harmful gases? All vehicles are harmful in general to humans?

Answer B is the only one that makes sense BASED ON the premises you have there, namely that by doing exercise outdoors you already inhale a large amount of gases but by doing so at peak hours when there are even MORE vehicles, that would mean more pollution and more inhaled.

No worries. You will get it as long as you do not stray too far. Remember: Do not assume too much.

As for your first one which is even less GMATy because it is just testing a basic concept here. Plenty of GMAT like questions quite soon but you need to solidify yourself on such questions first. There is a reason for this: As an analogy, it would not make sense to study higher level SC Clauses and Fragments before you do not know what the basic Subject Verb Agreement construct is, as one is a stepping stone to the other and not visa versa.

Again an Inference question here:

A goes too far as nothing is assured in terms of number of hours studied (again look at the Premise 2)

B goes too far as we have no idea about what the number of hours are needed are that can ensure this.

C corresponds quite neatly with Premise B - this really is not a big jump! What does the premise say? That if you want to have a chance at passing you should study for at least 10 hours. I would say this is spot on in terms of NOT taking a big jump.

D mentions passing THE COURSE. Did you pay attention? Do we know that passing or failing the test means passing or failing the course?? Please please be more attentive.

E we can discount fairly easily.

That's it!

Lesson? With Inference questions we are looking for only smaller steps from the premises not large conclusions and assumptions. In addition, it is crucial to pay attention to details.

By the way - always a good idea to use the ask a tutor system on the course for further clarification or talk to an instructor. We are always happy to help!

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Re: Ask Economist GMAT Tutor a question! [#permalink] New post 01 Oct 2013, 04:21
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OK...I obviously missed the word "course" when the passage is talking about the "test". My bad, I should not have missed that.

The car question though....hmmmmmm

Anyways, cheers for the response. I'm starting to use the Ask a Tutor function in the app and you guys respond pretty quickly, so that's good.
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Re: Ask Economist GMAT Tutor a question! [#permalink] New post 04 Mar 2014, 04:55
Does x = y ?
(1) | x | = | y |
(2) X^2=Y^2
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Re: Ask Economist GMAT Tutor a question! [#permalink] New post 18 Mar 2014, 14:54
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This is a Yes/No type Data Sufficiency question about absolute value and even powers. The missing piece of information is the value of the variables x and y. Here, as with most DS format questions, it's a good idea to proceed by using Plugging-In.

Stat.(1) allows us to use a Plug-In of x = 5, y = 5 and this leads to an answer of Yes in the question stem. Now, we need to see if we can find a pair of x and y that can lead to the other answer, i.e. No. So, we need to find a pair of values for x and y where |x|= |y| but x is not equal to y. We can achieve this by having x and y with different signs, for example x = 5 and y = -5. This gives an answer of No to our question stem. So, Stat.(1) leads to more than one answer and is Insufficient. We can eliminate answer choices A and D and consider B, C and E.

If we look at Stat.(2) we can see that the same two pairs of Plug-Ins will work for this statement also, because when x and y are equal, their squares are also equal and when x = 5 and y = -5 both x-squared and y-squared are equal to 25. So, we can still get a Yes and a No answer, so Stat.(2) is also Insufficient, we can eliminate answer choice B and consider C and E.

As we were able to use the same Plug-Ins with both statements alone, this pair of Plug-Ins will also work with Stat.(1) and Stat.(2) together, so the statements together are also Insufficient and the correct answer is E.
Re: Ask Economist GMAT Tutor a question!   [#permalink] 18 Mar 2014, 14:54
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