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

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BSchool Forum Moderator
Joined: 17 Jun 2016
Posts: 488

Kudos [?]: 229 [0], given: 200

Location: India
GMAT 1: 720 Q49 V39
GMAT 2: 710 Q50 V37
GPA: 3.65
WE: Engineering (Energy and Utilities)
Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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24 Jun 2017, 21:40
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.

Plural Subject "Rock Samples" needs a plural verb "have" so option A and B are out

(A) has been dated to be 3.47 billion years old and thus is
Incorrect for the reason mentioned above

(B) has been dated at 3.47 billion years old and thus
Same as A

(C) have been dated to be 3.47 billion years old and thus are
Here is the verbs "have" and "are" are correctly used for plural subject samples but the idiom "dated to be" is incorrect...it must be "dated at"

(D) have been dated as being 3.47 billion years old and thus
Again the idiom "dated as being" is incorrect. Correct idiom is "dated at"
Also, after "thus" the verb "are" is required otherwise the sentence becomes a run-on sentence

(E) have been dated at 3.47 billion years old and thus are
Idiom and the verbs are correctly used.
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Manager
Joined: 24 May 2017
Posts: 73

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

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27 Jun 2017, 01:49
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 - "has been " does not work with plural "rock samples"
(B) has been dated at 3.47 billion years old and thus - "has been " does not work with plural "rock samples"
(C) have been dated to be 3.47 billion years old and thus are - "dated to be" incorrect idiom, although rest of the sentence is just fine
(D) have been dated as being 3.47 billion years old and thus - "are" missing after "thus"
(E) have been dated at 3.47 billion years old and thus are - CORRECT.. problems noted in above options are removed
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NOTE: I am not an expert, therefore my analysis answering the questions may be incorrect and may not be relied upon. However I will appreciate if you can correct the mistakes I may have made in my analysis.

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Director
Joined: 12 Nov 2016
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Re: Rock samples taken from the remains of an asteroid about twice the siz [#permalink]

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18 Aug 2017, 19:53
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

Between C and E- actually E is preferable because the idiom "dated at" is literal and implies that the rocks have indeed been dated at that age. Dated to be may actually imply speculation-

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

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18 Aug 2017, 23:11
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 - Correct. Rock samples ... have been dated at...

Take away: Dated at is the correct idiom.

Kudos [?]: 17 [0], given: 76

Re: Rock samples taken from the remains of an asteroid about twice the siz   [#permalink] 18 Aug 2017, 23:11

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