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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, 07:16
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Question Stats:

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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, 08:20, edited 1 time in total.
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16 Jul 2010, 13:24
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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Re: the National Institute on Drug Abuse [#permalink]

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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: the National Institute on Drug Abuse [#permalink]

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18 Nov 2010, 02:46
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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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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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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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According to surveys by the National Institute on Drug Abuse [#permalink]

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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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11 Jul 2013, 00:36
1
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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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Twice vs Double---Need ur thoughts. [#permalink]

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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 :

(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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15 May 2015, 06:04

However, I have a doubt here...
If I replace twice by double, then would it be correct?

i.e. if the choice were
(E) double the number reported in the 1977 survey

then would it be correct?
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Re: According to surveys by the National Institute on Drug [#permalink]

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09 Mar 2016, 21:05
shikhar 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

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 ...

Yes Shikhar.. As much as a wrong usage here. Much is used for uncountable Noun and Many is used for countable noun. Here adults can be counted so usage of MUCH is TOTALLY wrong.
Hope this is clear
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Re: According to surveys by the National Institute on Drug [#permalink]

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29 Apr 2017, 17:37
Merged topics. Please, search before posting questions!
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Re: According to surveys by the National Institute on Drug   [#permalink] 29 Apr 2017, 17:37
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