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## Rock Samples

This topic has 1 expert reply and 6 member replies
varundaga05 Senior | Next Rank: 100 Posts
Joined
29 Jan 2010
Posted:
64 messages
1

#### Rock Samples

Wed May 26, 2010 3:28 pm
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

Joined
24 Mar 2010
Posted:
808 messages
Followed by:
4 members
50
Thu May 27, 2010 9:20 am
Yup, dated at is correct idiom. Answer should be E

### GMAT/MBA Expert

Patrick_GMATFix GMAT Instructor
Joined
21 May 2010
Posted:
1053 messages
Followed by:
98 members
335
Thu May 27, 2010 10:59 am
Haaress 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.

The sentence requires 2 fixes.

1. Subject -verb agreement .. Plural Suject - Samples - takes a plural verb Have.
2. Idiom - Its unidiomatic to say Dated to be . The correct idiom is Dated at.

The OA must be E.
I hope that helps.
Great explanation

_________________

Haaress Master | Next Rank: 500 Posts
Joined
22 Apr 2010
Posted:
151 messages
14
Wed May 26, 2010 6:44 pm
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.

The sentence requires 2 fixes.

1. Subject -verb agreement .. Plural Suject - Samples - takes a plural verb Have.
2. Idiom - Its unidiomatic to say Dated to be . The correct idiom is Dated at.

The OA must be E.
I hope that helps.

neha.patni Master | Next Rank: 500 Posts
Joined
16 Dec 2009
Posted:
227 messages
3
Test Date:
12th Aug, 2010
Target GMAT Score:
700+
Thu May 27, 2010 5:41 am
varundaga05 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
IMO C

neha.patni Master | Next Rank: 500 Posts
Joined
16 Dec 2009
Posted:
227 messages
3
Test Date:
12th Aug, 2010
Target GMAT Score:
700+
Thu May 27, 2010 5:42 am
neha.patni wrote:
varundaga05 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
IMO C
What is the OA?

gmat_perfect Legendary Member
Joined
24 Feb 2010
Posted:
1083 messages
Followed by:
13 members
127
Thu May 27, 2010 6:32 am
varundaga05 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
The answer should be E because of the following reasons:
1. Rock samples need the verb "have".
2. "Dated at" is preferable to "dated to be.

ymach3 Senior | Next Rank: 100 Posts
Joined
13 Jul 2009
Posted:
51 messages
1
Thu May 27, 2010 7:22 am
One more for E...

Rock samples...... have.

dated at - correct idiom.

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