GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 15 Dec 2018, 11:13

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### \$450 Tuition Credit & Official CAT Packs FREE

December 15, 2018

December 15, 2018

10:00 PM PST

11:00 PM PST

Get the complete Official GMAT Exam Pack collection worth \$100 with the 3 Month Pack (\$299)
• ### FREE Quant Workshop by e-GMAT!

December 16, 2018

December 16, 2018

07:00 AM PST

09:00 AM PST

Get personalized insights on how to achieve your Target Quant Score.

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

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 18 Sep 2009
Posts: 285

### Show Tags

02 Mar 2012, 14:20
4
50
00:00

Difficulty:

25% (medium)

Question Stats:

66% (00:49) correct 34% (01:04) wrong based on 3782 sessions

### HideShow timer Statistics

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
Current Student
Joined: 19 Mar 2012
Posts: 4394
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

21 Sep 2012, 23:14
23
39
Concept tested: Idioms, SV agreement
Difficulty Level: Moderate
Illustration: “Rock samples” is the subject for the verb “has been dated”. Rock samples must take a plural verb.
So A and B can be instantly eliminated.
Dated at is the correct idiomatic construction.
So C and D are also eliminated
E is the correct answer choice

Tip: Though “dated at” is preferred to “dated to be”, the same construction is not necessarily true for “estimated at” and “estimated to be” construction.
“Estimated at” should be followed by a noun because “at” is a preposition.
E.g: The molten iron is estimated at 1500 degrees Celsius.
“Estimated to be” generally follows phrases
E.g: The fossil is estimated to be 1000 years old.

This is NOT a specific English rule, but the way GMAT wants things to be
Support is given by:
In OG 12, Q 27 of SC, it says that the correct idiom is "estimated to be".
However this question appears in gmatprep
"With surface temperatures estimated at minus 230 degrees Farenheit, Jupiter's moon Europa has long been considered far too cold to support life, and with 60 square miles of water though to be frozen from top to bottom."

We can see from the non underlined part that "estimated at" is also as correct idiom.
Takeaway: Same rules do not apply to "estimated to be" and "dated to be"
_________________
Manager
Joined: 12 Mar 2012
Posts: 247
Concentration: Operations, Strategy
Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

14 Mar 2012, 22:55
4
1
1
TomB wrote:
Hai saarang

I know that " rock samples" is the subject of the sentence. I need some perfection in eliminating middlemen to find the subject and verb of a sentence. " the size" is between "about twice" and "of the 6-mile asteroid". how should I eliminate " the size".

The method i followed is "about twice the size of the 6-mile-wide asteroid " is a prepositional phrase. Is this correct.

The correct answer is E not C. "dated at" is the correct idiom

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

All part in red are wrong with respect to idioms and subject verb agreement. E is correct. Hope this helps..!!
_________________

Practice Practice and practice...!!

If there's a loophole in my analysis--> suggest measures to make it airtight.

##### General Discussion
Magoosh GMAT Instructor
Joined: 28 Nov 2011
Posts: 301
Re: Rock samples taken from the remains of an asteroid about  [#permalink]

### Show Tags

06 May 2012, 18:01
12
8
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 ANSWER

The subject 'rock samples' is plural so both the verb after 'dinosaurs', 'have', and the verb before 'evidence', 'are', have to be plural.

The correct idiom is 'dated at.'

Hope that helps .
_________________

Christopher Lele
Magoosh Test Prep

Current Student
Joined: 19 Mar 2012
Posts: 4394
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Rock samples taken from the remains of an asteroid about  [#permalink]

### Show Tags

05 Aug 2012, 12:18
Quote:
* "at" is a preposition.
* prepositions must be followed by nouns.
* "xxx number of years old" is not a noun.
so, wrong.

in the other example -- "temperatures estimated at xxxx degrees fahrenheit" -- there's no problem, because "xxxx degrees fahrenheit" is a noun.

i don't think anything else is happening here.
the OG explanations are wrong fairly regularly (though not in most cases); this is one of those times.

This is what Ron Purewal of Manhattan GMAT has to say about estimated at/to be scenario
Shouldn't the same logic apply to dated at/dated to be as well?
_________________
Manager
Status: Fighting again to Kill the GMAT devil
Joined: 02 Jun 2009
Posts: 112
Location: New Delhi
WE 1: Oil and Gas - Engineering & Construction
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

22 Sep 2012, 00:46
1
1
souvik101990 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

As rightly written by @Archillees - SV Agreement error >

Also to note is Difference between C and E
C uses subjunctive form - "to be" which is not required here.
E uses correct idiom "dated at"
_________________

Giving Kudos, is a great Way to Help the GC Community Kudos

Current Student
Joined: 19 Mar 2012
Posts: 4394
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

22 Sep 2012, 01:05
Before moving to OE
What is the correct idiom for:
estimated to be Vs estimated at?
_________________
Current Student
Joined: 19 Mar 2012
Posts: 4394
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

22 Sep 2012, 12:42
methevoid wrote:
souvik101990 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

As rightly written by @Archillees - SV Agreement error >

Also to note is Difference between C and E
C uses subjunctive form - "to be" which is not required here.
E uses correct idiom "dated at"

Hey,
"to be" is neither used as a command subjunctive nor used as a hypothetical subjunctive.
For them you need special command verbs like demand, order, require etc.
They are popularly known as "bossy verbs"
Hypothetical subjunctive, as the name suggests, uses hypothetical constructions such as "were", "would" etc.

Souvik
_________________
Intern
Joined: 06 Oct 2012
Posts: 13
Concentration: Strategy, Other
GMAT Date: 06-24-2013
Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

22 Sep 2012, 14:51
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 modifier in bold red it modifying - remains of asteroid or asteroid. Also is this modified "adjective phase". If so should it have a comma before it or not?
Current Student
Joined: 19 Mar 2012
Posts: 4394
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

09 Oct 2012, 23:34
1
Concept tested: Idioms, SV agreement
Difficulty Level: Moderate
Illustration: “Rock samples” is the subject for the verb “has been dated”. Rock samples must take a plural verb.
So A and B can be instantly eliminated.
Dated at is the correct idiomatic construction.
So C and D are also eliminated
E is the correct answer choice

Tip: Though “dated at” is preferred to “dated to be”, the same construction is not necessarily true for “estimated at” and “estimated to be” construction.
“Estimated at” should be followed by a noun because “at” is a preposition.
E.g: The molten iron is estimated at 1500 degrees Celsius.
“Estimated to be” generally follows phrases
E.g: The fossil is estimated to be 1000 years old.

This is NOT a specific English rule, but the way GMAT wants things to be
Support is given by:
In OG 12, Q 27 of SC, it says that the correct idiom is "estimated to be".
However this question appears in gmatprep
"With surface temperatures estimated at minus 230 degrees Farenheit, Jupiter's moon Europa has long been considered far too cold to support life, and with 60 square miles of water though to be frozen from top to bottom."

We can see from the non underlined part that "estimated at" is also as correct idiom.
Takeaway: Same rules do not apply to "estimated to be" and "dated to be"
_________________
e-GMAT Representative
Joined: 02 Nov 2011
Posts: 2773
Re: Rock samples taken from the remains of an asteroid  [#permalink]

### Show Tags

11 Oct 2013, 06:55
Mission2012 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 modifier in bold red it modifying - remains of asteroid or asteroid. Also is this modified "adjective phase". If so should it have a comma before it or not?

Hi,

Note that the highlighted portion doesn’t entirely consist of a single modifier.

I suggest you analyze the sentence structure to understand the role played by each element.

Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid
has been dated to be 3.47 billion years old and
thus is evidence of the earliest known asteroid impact on Earth.

The highlighted modifier presents a comparison with another “asteroid”.

So it would be logical to presume that the entire modifier is modifying “asteroid”, not “remains”.

Since this modifier is used to modify a noun, we can call it a “Noun Modifier”.

Observe that the modifier is in the non-underlined portion of the official sentence and so it should be correct as such.

Of course, enclosing it in a comma pair won’t make it incorrect. However, it would be unnecessary.

Hope this helps!

Regards,
Krishna
_________________

| '4 out of Top 5' Instructors on gmatclub | 70 point improvement guarantee | www.e-gmat.com

Intern
Joined: 17 Dec 2014
Posts: 15
Sentence correction: idiom "dated at"  [#permalink]

### Show Tags

20 Apr 2015, 20:13
I'm studying with the 2015 Official Guide and the very last question (#140) of the sentence correction section is this:

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 correct answer was "have been dated at 3.47 billion years old and thus are."

I've always thought of this phrase to be "dated to be XXX years old." For anyone who's seen similar questions, does GMAT treat "dated at" as the correct idiom at all times?

(There is a similar question that uses the word "estimated," but this one states "estimated to be XYZ years old" to be the correct answer. )
Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4489
Re: Sentence correction: idiom "dated at"  [#permalink]

### Show Tags

22 Apr 2015, 15:46
daysandhours wrote:
I'm studying with the 2015 Official Guide and the very last question (#140) of the sentence correction section is this:

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 correct answer was "have been dated at 3.47 billion years old and thus are."

I've always thought of this phrase to be "dated to be XXX years old." For anyone who's seen similar questions, does GMAT treat "dated at" as the correct idiom at all times?

(There is a similar question that uses the word "estimated," but this one states "estimated to be XYZ years old" to be the correct answer. )

Dear daysandhours,
I'm happy to respond.

The idiom "dated at" is 100% correct and favored by the GMAT, whereas "dated to be" is awkward and unidiomatic. I discuss this in this blog:
https://magoosh.com/gmat/2013/gmat-prep ... potpourri/

You may find helpful our free GMAT Idiom ebook:
https://magoosh.com/gmat/2013/gmat-idiom-ebook/
This information is also available in free Flash Card form:
https://gmat.magoosh.com/flashcards/idioms

Does all this make sense?
Mike
_________________

Mike McGarry
Magoosh Test Prep

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Current Student
Joined: 19 Mar 2012
Posts: 4394
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Sentence correction: idiom "dated at"  [#permalink]

### Show Tags

03 May 2015, 18:01
2
GMAT likes "dated at" but "estimated to be"
GMAT is annoying at times.
_________________
VP
Joined: 27 Mar 2010
Posts: 1023
Location: Bangalore, India
Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

12 Nov 2015, 21:04
Hi! estimated to be and dated at are both separate and correct idioms.
_________________

Thanks,
Ashish
EducationAisle, Bangalore

Sentence Correction Nirvana available on Amazon.in and Flipkart

Now! Preview the entire Grammar Section of Sentence Correction Nirvana at pothi.com

Magoosh GMAT Instructor
Joined: 28 Dec 2011
Posts: 4489
Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

13 Nov 2015, 10:32
I'm happy to jump in here. Yes, as EducationAisle, the idioms "dated at" and "estimate X to be" are 100% valid GMAT idioms. These and many more are included in our free GMAT Idiom Flashcards.
https://gmat.magoosh.com/flashcards/idioms
Enjoy!
Mike
_________________

Mike McGarry
Magoosh Test Prep

Education is not the filling of a pail, but the lighting of a fire. — William Butler Yeats (1865 – 1939)

Director
Joined: 04 Jun 2016
Posts: 571
GMAT 1: 750 Q49 V43
Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

09 Jul 2016, 00:46

EXPLANATION :-
1) dated at is the correct idiom

2) the subject of the sentence is "rock samples" therefore SV agreement dictates that we use "Have". "Has" is incorrect

only E uses both "dated at" and "have"

souvik101990 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

_________________

Posting an answer without an explanation is "GOD COMPLEX". The world doesn't need any more gods. Please explain you answers properly.
FINAL GOODBYE :- 17th SEPTEMBER 2016. .. 16 March 2017 - I am back but for all purposes please consider me semi-retired.

Moderator
Joined: 21 Jun 2014
Posts: 1098
Location: India
Concentration: General Management, Technology
GMAT 1: 540 Q45 V20
GPA: 2.49
WE: Information Technology (Computer Software)
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

19 Aug 2016, 12:33
souvik101990 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.

rock samples......., have. correct match of SV.
dated at - correct idiom
have been dated ...and thus are... parallel

(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
_________________

---------------------------------------------------------------
Target - 720-740
Project PS Butler - https://gmatclub.com/forum/project-ps-butler-practice-everyday-280904.html
http://gmatclub.com/forum/information-on-new-gmat-esr-report-beta-221111.html
http://gmatclub.com/forum/list-of-one-year-full-time-mba-programs-222103.html

Manager
Joined: 10 Mar 2014
Posts: 192
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

29 Jan 2017, 23:02
Hi Experts,

Dated to be vs Dated at

Thanks
Manhattan Prep Instructor
Joined: 22 Mar 2011
Posts: 1356
Re: Rock samples taken from the remains of an asteroid about twice the siz  [#permalink]

### Show Tags

29 Jan 2017, 23:40
1
PathFinder007, this difference seems to have been discussed a good deal in the thread. Do you have a specific question about it?

The short answer is that "dated to be" doesn't work. We estimate/believe/prove something "to be" a certain age, but that doesn't work with "date." You could say "I estimate that this rock is 3 billion years old." You couldn't say "I date that this rock is 3 billion years old." It just isn't the same kind of verb. Similarly, you can say "I estimate it to be 3 billion years old" and not "I date it to be 3 billion years old."
_________________

Dmitry Farber | Manhattan GMAT Instructor | New York

Manhattan GMAT Discount | Manhattan GMAT Course Reviews | View Instructor Profile |
Manhattan GMAT Reviews

Re: Rock samples taken from the remains of an asteroid about twice the siz &nbs [#permalink] 29 Jan 2017, 23:40

Go to page    1   2    Next  [ 29 posts ]

Display posts from previous: Sort by