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It is quite common for one noun to modify another.
BASEBALL player
JAZZ pianist
GRAMMAR expert

In each of the cases above, the first noun serves to modify the second.
A noun that serves to modify another noun is called an ATTRIBUTIVE NOUN.

Avinashkr29
Can someone explain to me the meaning of "a city economy" ?

Here, city is an attributive noun modifying economy.
Question: What KIND of economy?
Answer: a CITY economy
city economy = the economy of a city
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Sometimes it serves as an EXPLETIVE: a placeholder pronoun whose purpose is to DELAY THE SUBJECT.
On the GMAT, the delayed subject will often be an infinitive phrase or a that-clause.

IT is easy TO LIKE MARY.
Here, it is standing in for to like Mary.
Conveyed meaning:
TO LIKE MARY is easy.

IT was not until last year THAT JOHN BEGAN STUDYING.
Here, it is standing in for that John began studying.
Conveyed meaning:
THAT JOHN BEGAN STUDYING was not until last year.

lakshya14
What does "it" stands for in (E)?

OA: It will be difficult to absorb them into a city economy.
Here, it is standing in for to absorb them into a city economy.
Conveyed meaning:
TO ABSORB THEM INTO A CITY ECONOMY will be difficult.
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I am confused as to why D is incorrect. https://gmatclub.com/forum/idiom-use-so ... 20549.html says that "so X as to" is idiomatically correct as long as the "to" is part of a infinitive verb, which in this case it is ("to be").

My only guess here is that the "so X" referes to "so much" rather than "so lacking". If it was "so lacking" would you be able to argue it's correct?
I also didn't like how every other answer used "them" when we have two plural nouns is could refer back to (Students, math skills).

Can anyone provide a much clearer explanation of this question?
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fireagablast
I am confused as to why D is incorrect. https://gmatclub.com/forum/idiom-use-so ... 20549.html says that "so X as to" is idiomatically correct as long as the "to" is part of a infinitive verb, which in this case it is ("to be").
Hi fireagablast, there indeed are several officially correct answers that use so as to. For example:

Often major economic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the financial markets.

The Emperor Augustus, it appears, commissioned an idealized sculpture portrait, the features of which are so unrealistic as to constitute what one scholar calls an "artificial face."


As a general guideline, the usage of so as to is correct when the intent is to redefine/explain the adjective following so.

On the other hand, if the intent is to depict a cause & effect, then so that should be used.

For example:

Incorrect: Technically, "quicksand" is the term for sand that is so saturated with water as to acquire a liquid's character.

Correct: Technically, "quicksand" is the term for sand that is so saturated with water that it acquires the character of a liquid.

Cause: Saturation
Effect: It acquires the character of a liquid.

Similarly, in the sentence under consideration,

Cause: Lack of Math skills in students in the metropolitan school district.
Effect: it will be difficult to absorb them into a city economy becoming ever more dependent on information-based industries

Since this sentence is representative of cause and effect scenario, so that is the appropriate usage.
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Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming ever more dependent on information-based industries.

grammar error
(C)Students in the metropolitan school district lack of math skills is so large as to be difficult to absorb them into a city’s economy that becomes
(B)Students in the metropolitan school district lack math skills to a large enough degree that they will be difficult to absorb into a city’s economy that becomes

meaning error
(A)Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming (wrong meaning)
(D)Students in the metropolitan school district are lacking so much in math skills as to be difficult to absorb into a city’s economy becoming( double meaning)

(E)Students in the metropolitan school district are so lacking in math skills that it will be difficult to absorb them into a city economy becoming (OA)

they will be difficult to absorb into a city’s economy that becomes...(fine)
it will be difficult to absorb them into a city economy becoming...(fine)
they make it difficult to absorb them into a city economy becoming (x)
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I have a question: Do people know just by looking at choice A that it is testing the "so X that Y" idiom?
Many explanations in the thread mention that as a reason for elimination of choice A. Are people able to identify based on the use case (wherein the sentence wants to highlight extent of something and they expect only this particular idiom to be used and no other? ) or only after looking at all answer choices could they identify the idiom tested? Just wanted to understand the mindset of people while solving this question.
I wasn't able to eliminate A right away(not knowing the idiom), but was able to eliminate B/C/E based on other errors. Between A and E, it was mostly a hunch(after wasting some time debating between the two).
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In E, why "city economy" is correct? Shouldn't it be "city's economy"?
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Is it possible to add ‘idiom’ tag to this question as it tests ‘So X as to Y’?
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Is it possible to add ‘idiom’ tag to this question as it tests ‘So X as to Y’?

Done. Thank you for the suggestion!
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how do I understand that the phrase - '' City's economy " makes it seem that there is some specific city ?
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how do I understand that the phrase - '' City's economy " makes it seem that there is some specific city ?
Yes, "a city's economy" seems to refer to the economy of a single, unspecified city (which may or may not be the city where the metropolitan school district is!).

The phrase "city economy" is more like "tennis court" -- "city" modifies "economy" just as "tennis" modifies "court"

I hope that helps!
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Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming ever more dependent on information-based industries.

(A) lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming
(B) lack math skills to a large enough degree that they will be difficult to absorb into a city’s economy that becomes
(C) lack of math skills is so large as to be difficult to absorb them into a city’s economy that becomes
(D) are lacking so much in math skills as to be difficult to absorb into a city’s economy becoming
(E) are so lacking in math skills that it will be difficult to absorb them into a city economy becoming

Between A & E, E is grammatically correct. In option A, "it" refers to the noun phrase "absorbing them into a city economy becoming..". This phrase, however, is not present in the option as it is.
On the other hand, in E, "it" refers to "to absorb them into a city economy becoming.." and this is present as it is in the option.
"It" never refers to a noun in a noun phrase but refers to the noun phrase itself.
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TommyWallach
Hey All,

Lots of great conversation surrounding this one. At MGMAT, we use this question to demonstrate a fundamental rule of sentence correction, namely that the correct answer often sounds terrible. The reason the correct answer here sounds so bad (and why many of you didn't pick it), is because of the use of the rare idiom so X as to Y, and the present participle. I'll explain:

Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming ever more dependent on information-based industries.

(A) lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming
PROBLEM: So x as to Y is the idiom, as many of you pointed out. Also, the subject of "to absorb" is highly unclear. Who's absorbing them?

(B) lack math skills to a large enough degree that they will be difficult to absorb into a city’s economy that becomes
PROBLEM: "large enough degree that" is not idiomatic. "City's economy" makes it seem that there is some specific city, which is odd (though not inherently wrong). Finally "becomes" makes it seem as if this hasn't happened yet, but the point is that it is happening at present.

(C) lack of math skills is so large as to be difficult to absorb them into a city’s economy that becomes
PROBLEM: You can't really have a "large" "lack of math skills". Same two points at the end as before.

(D) are lacking so much in math skills as to be difficult to absorb into a city’s economy becoming
PROBLEM: Again, the so X as to Y is wrong. City's economy remains weird.

(E) are so lacking in math skills that it will be difficult to absorb them into a city economy becoming
ANSWER: So X as to Y is correct. Becoming is a present participle modifying city economy, and it makes it clear that this is currently happening.

For what it's worth, all of these answer choices also have an ambiguous pronoun ("them" could be math skills or students), but apparently GMAT figured it wasn't important here. Silly GMAT.

Hope that helps!

-tommy

Why City's economy is wrong here?
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