According to surveys by the National Institute on Drug : GMAT Sentence Correction (SC)
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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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06 Sep 2005, 06:16
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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 Zarrolou on 10 Jul 2013, 07:20, edited 1 time in total.
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Re: the National Institute on Drug Abuse [#permalink]

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18 Nov 2010, 01:46
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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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According to surveys by the National Institute on Drug [#permalink]

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03 Mar 2012, 12:32
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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

is there a solid reason behind discarding D.??
Is it because they have used as much for countable quantity.
so it shud be either twice as many or twice the number ...

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19 May 2012, 03:27
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The comparison has to be like. As the number (or percentage) of adults is being adults is being reported in 1979, it must be compared to a number (and not to the number of adults) in 1977.

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

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10 Jul 2013, 23:36
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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

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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06 Sep 2005, 08:25
btw D & E...

E seems to refer the number unambigously...E it is..
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07 Sep 2005, 05:47
OA is E.
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According to surveys by the National Institute on Drug [#permalink]

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17 Aug 2009, 13:56
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
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17 Aug 2009, 14:42
noboru wrote:
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

I pick E.

'to' in B is wrong.
'as much as' in D is wrong since young adults are countable.
'doubling those' and 'twice those' don't sound right.
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17 Aug 2009, 15:21
twice the number is correct , so , E is correct
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17 Aug 2009, 16:34
E, as we are comparing a number...20%
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17 Aug 2009, 20:36
"twice the number" sounds proper

E is my take
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27 Jun 2010, 17:43
I got the same answer as E but not sure of why C is incorrect?
is it because "twice those" is UNIDIOMATIC?
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16 Jul 2010, 12:24
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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According to surveys by the National Institute on Drug [#permalink]

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06 Nov 2010, 19:21
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: the National Institute on Drug Abuse [#permalink]

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06 Nov 2010, 19:29
will go with E. "twice the number" - the 20 pc in 1979 was twice the number reported in the survey in 1977
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Re: the National Institute on Drug Abuse [#permalink]

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07 Nov 2010, 11:34
(A) doubling those reported in the 1977 survey [Changes the intended meaning]
(B) to double the number the 1977 survey reported [Changes the meaning]
(C) twice those the 1977 survey reported [Gramatically incorrect]
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey

Should be either D or E.

In E: When we say of "twice" the number it means twice of a number, here 20% is a not a number, but a relative measure of quantity.

Hence I choose D

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Re: the National Institute on Drug Abuse [#permalink]

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07 Nov 2010, 13:02
rockroars wrote:
(A) doubling those reported in the 1977 survey [Changes the intended meaning]
(B) to double the number the 1977 survey reported [Changes the meaning]
(C) twice those the 1977 survey reported [Gramatically incorrect]
(D) twice as much as those reported in the 1977 survey
(E) twice the number reported in the 1977 survey

Should be either D or E.

In E: When we say of "twice" the number it means twice of a number, here 20% is a not a number, but a relative measure of quantity.

Hence I choose D

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Correct me if I am wrong.

What does 'those' refer to in choice D?
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Re: the National Institute on Drug Abuse [#permalink]

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09 Nov 2010, 00:12
those refer to people consuming cocaine
i reckon , but answer seems to be option E "as much as" looks verbose
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Re: the National Institute on Drug Abuse [#permalink]

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17 Nov 2010, 17:19
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: the National Institute on Drug Abuse   [#permalink] 17 Nov 2010, 17:19

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