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generis
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I chose (E). Basically I have to decide between (C) and (E), and the difference is
> Estimate the number at 60 (in C)
OR
> Estimate the number to be 60 (in E)

Well, this tests the idiomatic use of estimate, but I could not recall if there is anything special in GMAT. Failing that, I have to rely on my own instinct. I would always use "estimate the number to be 60", and that is why my answer is E.

For (A), (B), and (D), the subject of the sentence (the number) cannot serve as logical subject for the modifier ("Defining a medical ... ). They can be ruled out rather easily.
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generis

Project SC Butler: Day 204: Sentence Correction (SC2)


For SC butler Questions Click Here

Defining a medical practitioner as “any individual whose occupation is basically concerned with the care of the sick,” the number of women medical practitioners in the city of London was estimated at 60 in 1560 by the researchers.

A) the number of women medical practitioners in the city of London was estimated at 60 in 1560 by the researchers

B) the women medical practitioners in the city of London was estimated to be 60 in 1560 according to the researchers

C) the researchers estimated the number of women medical practitioners in the city of London at 60 in 1560

D) in 1560, the number of women medical practitioners was estimated to be 60 in the city of London by the researchers

E) the researchers estimated the number of women medical practitioners in the city of London to be 60 in 1560

"Defining a medical practitioner" modifies "the researchers" and thus "the researchers" should act as a subject of the following clause. - A, B and D out

"Estimated to be" vs "Estimated at" -> Estimated to be is the first preference hence correct. Even though Estimated at has been correct int he Official question, Estimated at is usually used when used for a location.


IMO
Answer - E
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Defining a medical practitioner as ...
This V+ing modifier modified the subject of the main sentence.
Subject who defines a medical practitioner is researcher. Either women or the number cannot be the subject, so A, B and D are wrong.

Between C and E, there is tiny difference, diffence that tests correct idiom usage.
Estimate to is correct idiom, hence E is our answer

Posted from my mobile device
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I have posted the official explanation here
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No worries, people, this one isn't so bad.

This SC tests the dangling modifier rule. The first thing you should ask yourself is what the first clause is referring to. Is it the number of women practitioners? The women practitioners? The researchers? The answer is clearly the researchers. A, B, and D immediately get freebie eliminated.

Between (C) and (E), it's simply a question about idioms. The correct idiom is estimated to be.
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