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Rock samples taken from the remains of an asteroid about twice the

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Re: Rock samples taken from the remains of an asteroid about twice the  [#permalink]

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New post 01 May 2019, 18:33
DmitryFarber wrote:
No. We use "dated at" and "estimated to be."


Dear DmitryFarber

Is 'estimated at' idiomatic too? if yes, how can I use it different than 'estimate to be'?

Thanks in advance
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Re: Rock samples taken from the remains of an asteroid about twice the  [#permalink]

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New post 04 May 2019, 22:20
The "no" above was in reference to exactly that. I don't think we'll see "estimated at" in a correct answer. However, English is tricky--it depends on the intended meaning. We certainly can't say "estimated at X years old." The idiom is "estimated to be." But what about something else? I could imagine a sentence that said "The damage was estimated at $45 million dollars." This makes more sense than "to be," since a rock sample can BE millions of years old, but damages can't BE millions of dollars. Rather, millions of dollars in damages occurred.

Having said all that, I don't have an official SC question to validate that usage for the GMAT. If anyone can find a correct official answer with ANY use of "estimated at," I'd be interested to see it.
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Rock samples taken from the remains of an asteroid about twice the  [#permalink]

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New post 29 Nov 2019, 07:03
TomB wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are

Agreement; Idiom

The plural subject of this sentence, Rock samples, requires plural verb phrases—have been dated and are rather than has been dated and is. The idiomatic way of expressing estimation of age is with the phrase dated at.

(A) The subject and verbs do not agree; dated to be … is not idiomatic.

(B) The subject and verb do not agree; the conjunction and thus should be followed by a verb.

(C) Dated to be is not idiomatic.

(D) As being is not idiomatic; the conjunction and thus should be followed by a verb.

(E) Correct. The plural verbs match the plural subject, and the wording of the sentence is idiomatic.

The correct answer is E.


Main Issues:


1) SV: "Samples...have"
2) Correct Idiom: "dated at"

(A) has been dated to be 3.47 billion years old and thus is - Wrong: 1) SV 2) Idiom
(B) has been dated at 3.47 billion years old and thus - Wrong: 1) SV 2) Structure
(C) have been dated to be 3.47 billion years old and thus are - Wrong: Idiom
(D) have been dated as being 3.47 billion years old and thus - Wrong: 1) Idiom 2) Structure
(E) have been dated at 3.47 billion years old and thus are - Correct
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Rock samples taken from the remains of an asteroid about twice the   [#permalink] 29 Nov 2019, 07:03

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