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According to surveys by the National Institute on Drug

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According to surveys by the National Institute on Drug [#permalink]

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According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

(A) doubling those reported in the 1977 survey
(B) to double the number the 1977 survey reported
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey
[Reveal] Spoiler: OA

Last edited by broall on 17 Nov 2017, 08:58, edited 3 times in total.
Added OA.

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 03 Sep 2007, 03:07
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OlgaN wrote:
Consider the following:
51. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.(
(A) doubling those reported in the 1977 survey
(B) to double the number the 1977 survey reported
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey

http://www.gmatclub.com/forum/1/51309?highlight=double - similar question where double the figure is the best answer.
What is the difference between the use of number and figure?
As i know, better answer is as many as in...but there is no such answer.
Why there is twice the number, not twice the figure?


down to D and E.
D is out : 'those' ?

POE : I would bet on E.

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 26 Jan 2008, 18:21
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OlgaN wrote:
http://www.gmatclub.com/forum/11/48149?highlight=1000

that link does not work any more. Can you please explain when to use double vs. twice the number

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 31 Jan 2008, 00:26
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For ex: The percentage of increase in new CPU’s performance is twice the number to its predecessor’s ones.

(A) doubling those reported in the 1977 survey [Doubling incorrectly modifying the meaning – eliminate it]

(B) to double the number the 1977 survey reported [This is changing the meaning – eliminate it]

(C) twice those the 1977 survey reported [Number is compared people – eliminate it]

(D) twice as much as those reported in the 1977 survey [Number is compared people – eliminate it]

(E) twice the number reported in the 1977 survey [ The number is compared correctly – hold it]

Answer: E

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 20 May 2008, 00:29
"Doubling" and "to double" in A and B are verbs with no real subjects.
So I eliminated them.
Can you elaborate on how they modify meaning?
Is my reasoning incorrect?

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 20 May 2008, 00:51
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Answer option E.
Anirudh, both "Doubling" & "to double" when used sound as if 'about 20 percent of young adults' were causal to the increase in numbers. What essentially the author wants to mean is that tha 'number of young adults using cocaine' 'now' compared to '1970 survey' is double.

Option E takes care of this error making it more precise.

You might want to look at this sentence from OG11 for more explanation involving such usage..

The gyrfalcons, an arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970s.

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 20 May 2008, 01:39
dushver wrote:
Answer option E.
Anirudh, both "Doubling" & "to double" when used sound as if 'about 20 percent of young adults' were causal to the increase in numbers. What essentially the author wants to mean is that tha 'number of young adults using cocaine' 'now' compared to '1970 survey' is double.

Option E takes care of this error making it more precise.

You might want to look at this sentence from OG11 for more explanation involving such usage..

The gyrfalcons, an arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970s.


Hey, thanks for the explanation. Thats what I meant when I said no real subject. Since it is a verb form, the preceding noun appears to be the subject which modifies the intended meaning. I think its clear now.

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Re: According to surveys by the National Institute on Drug [#permalink]

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According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

(A) doubling those reported in the 1977 survey - '20% percent' [number] is compared to 'young people'
(B) to double the number the 1977 survey reported - surveys dont report.
(C) twice those the 1977 survey reported - '20% percent' [number] is compared to 'young people'
(D) twice as much as those reported in the 1977 survey - '20% percent' [number] is compared to 'young people'
(E) twice the number reported in the 1977 survey - '20% percent' [number] is correctly compared to 'number'

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 17 Nov 2010, 18:19
Nice catch, scheol - the presence of "those" in D should tip you off that something is wrong.

"Those" is clearly plural, but "much" is a singular modifier ("many" would be the plural), and the two would have to be part of the same comparison. So D is contradictory just at that.

"Those" really should refer to "the number", which is what was reported, so regardless that's wrong. E correctly compares the 1979 number to the new number, and is therefore correct. Nice work!
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Re: According to surveys by the National Institute on Drug [#permalink]

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According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

(A) doubling those reported in the 1977 survey - doubling those implies doubling people - Sounds awkward.
(B) to double the number the 1977 survey reported- to double the number implies - they did what they did(used cocaine) in order to double the number - sounds awkward.
(C) twice those the 1977 survey reported - twice people - Sounds awkward, rather have been twice the number of people.
(D) twice as much as those reported in the 1977 survey- twice as much as those implies that they used cocaine twice as much as people (and not the number of people)- Sounds awkward .
(E) twice the number reported in the 1977 survey - Twice the number reported Perfect construction implying that the number of people in 1979 who used cocaine was double the number of people in the 1977 survey..

So the answer is E .
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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 03 Mar 2012, 13:45
I am not an expert... But this is how I got to the answer...

51. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.
(A) doubling those reported in the 1977 survey -- What is those pointing to?? Replace "20 percent of young adults" in the later...and not proper
(B) to double the number the 1977 survey reported -- not proper
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey -- What is those
(E) twice the number reported in the 1977 survey -- correct


Still, I am looking forward from the experts on their approach
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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 22 May 2012, 21:31
nikhilarora88 wrote:
According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.
(A) doubling those reported in the 1977 survey
(B) to double the number the 1977 survey reported
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey



A: doubling those reported is not right as it is trying to double those young adults... HENCE WRONG
B: both segments are incomplete.. about 20% percent of young adults used cocaine in 1979 and to double the number the 1977 survey reported.. are we trying to double the number survey reported? hence WRONG
C: TWICE THOSE, is 1979 twice those? WRONG
D: TWICE as much as those reported.. here again 1979 is talked about hence WRONG
E: here it clearly compares 20% with the twice the number... hence CORRECT

may be i am wrong in understanding, can somebody help
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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 10 Jul 2013, 08:17
According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in
1979, doubling those reported in the 1977 survey.
A. doubling those reported in the 1977 survey
B. to double the number the 1977 survey reported
C. twice those the 1977 survey reported
D. twice as much as those reported in the 1977 survey
E. twice the number reported in the 1977 survey


Hi All, (What I know)
Twice is used for following comparison where some numbers or quantity is mentioned.

Ex:
He has got 50 balls,twice as many as I have.
USA has roughly twice as many people as India (does).

Similarly in the above example 20% is twice that present in 1977
Am I correct in understanding the usage of twice or any other way to find the usage.

If the options would have been

D1. twice as many as reported in the 1977 survey
D2. twice as many as those reported in the 1977 survey

Is D1/D2 correct?I do understand 20% is compared to a number in 1977 which is twice.Why can't we say 20 adults are twice that present in 1977. Is much used for % ?

Apology if I have not asked the question correct way.I want to clear my understanding of twice & much.

Last edited by Zarrolou on 10 Jul 2013, 08:20, edited 2 times in total.
Merging similar topics.

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 11 Jul 2013, 00:36
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ankurgupta03 wrote:
(C) twice those the 1977 survey reported
Why is this wrong
(E) twice the number reported in the 1977 survey
here the persons are compared to numbers, why is this correct

Some one please explain

hi ankur,

option E :==>NUMBERS ARE COMPARED TO NUMBERS AND NOT PERSON TO NUMBERS.

lets see: 20 percent of X=RESULT==>If you see..result is always a numerical value....whenever there is mathematics ...it is going to give you value.
for example: if you have 100 gm protein==>if i say 20 percent of protein you will burn while running==>what does this mean=>20 gm protein you will utilise while burning===>thats a numerical value===>so takeaway is that whenever you have PERCENT OF SOMETHING===>then you should always compare to numerical thing..and not to any other thing.

moreover in option C THOSE ==>it ise referring to children so we cant compare number with children.

hope it helps
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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 20 Jul 2013, 07:27
According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

(A) doubling those reported in the 1977 survey
(B) to double the number the 1977 survey reported
(C) twice those the 1977 survey reported
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey

Please find my understanding and let me know my mistakes.

Lets say there are 100 adults in 1977 and 1979.
About 20% is 20 in 1979 and it must be 10 in 1977.
if I re frame the question :

(D)about 20 adults used cocaine in 1979,twice 10 adults reported in 1977 survey.
(E)about 20 adults used cocaine in 1979,twice 10 reported in 1977 survey.

So whyn't D be a better answer.Because 20 adults is twice that of 10 adults reported in survey.

Last edited by Narenn on 20 Jul 2013, 08:01, edited 1 time in total.
Merging Similar Topics Refer to the Brian's post in the similar thread http://gmatclub.com/forum/according-to-surveys-by-the-national-institute-on-drug-19660.html#p820081

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 06 Feb 2014, 04:35
Q. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

A. doubling those reported in the 1977 survey
B. to double the number the 1977 survey reported
C. twice those the 1977 survey reported
D. twice as much as those reported in the 1977 survey
E. twice the number reported in the 1977 survey

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 06 Feb 2014, 04:35
Q. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

A. doubling those reported in the 1977 survey
B. to double the number the 1977 survey reported
C. twice those the 1977 survey reported
D. twice as much as those reported in the 1977 survey
E. twice the number reported in the 1977 survey

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Re: According to surveys by the National Institute on Drug [#permalink]

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 06 Feb 2014, 07:38
B out first, not knowing what B want to talk about.

A,D & C, "those" is a ambiguous reference of Pronoun, Out.

Also D "as much as" wordy, out 2X.

E is the best.

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Re: According to surveys by the National Institute on Drug [#permalink]

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New post 06 Feb 2014, 23:11
Klenex wrote:
Q. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, doubling those reported in the 1977 survey.

A. doubling those reported in the 1977 survey
B. to double the number the 1977 survey reported
C. twice those the 1977 survey reported
D. twice as much as those reported in the 1977 survey
E. twice the number reported in the 1977 survey



A,C and D are eliminated because we are trying to compare the percentage of young adults reported for cocaine use. We are not comparing the number of young adults or young adults between 1977 and 1979; we are rather comparing the percentage, which is a number. Meaning the sentence is reporting percentage as a number, which is 20 for the year 1979. The sentence means to say that the percentage reported in 1977 was 10 percent.

OC: E
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Re: According to surveys by the National Institute on Drug   [#permalink] 06 Feb 2014, 23:11

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