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# According to surveys by the National Institute on Drug

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Manager
Joined: 29 Jul 2004
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According to surveys by the National Institute on Drug [#permalink]

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29 Sep 2004, 18:05
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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

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Senior Manager
Joined: 21 Jun 2004
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29 Sep 2004, 18:44
E for me.
I would like some inputs here.
When to use double and when to go for twice?
_________________

510 on my first GMAT. 610 on second GMAT.!
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Manager
Joined: 24 Aug 2004
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29 Sep 2004, 21:47
'E' for me too.... but i am not very sure why not 'D'.

Quote:
I would like some inputs here.
When to use double and when to go for twice?

'double' is mostly used as a verb.
'twice' is used as adjective , and used for comparision.
for eg.

The sales of a company named ABC Ltd. doubled in two years from 2000 to 2002.
Here 'double; is used as a verb.
however, the same sentence can be written as:

The sales of a company named ABC Ltd. in year 2002 was twice that in year 2000.

here 'twice' has been used to compare the sales in 2002 with respect to sales in 2000.

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Intern
Joined: 12 Apr 2004
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Location: INDIA

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29 Sep 2004, 23:47
shud not D be 'twice as many as' - 20% is countable....
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'njoi !
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Director
Joined: 20 Jul 2004
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30 Sep 2004, 06:37
D.

We cannot compare adults to number as in E.
I think Percentages/fractions are quantities and as much as 20% is fine.

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GMAT Club Legend
Joined: 15 Dec 2003
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30 Sep 2004, 06:55
I think we are refering to percentages. "number" in E should properly refer to the difference in percentages in both years.
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Best Regards,

Paul

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Director
Joined: 31 Aug 2004
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30 Sep 2004, 07:19
Agree with Paul, it seems that the clause is related to percentage and not persons... So that number fits better than "those"

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Manager
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30 Sep 2004, 17:35
I had chosen D...

The OA is E and it still confounds me as to why it is so...

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Director
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31 Aug 2005, 05:19
Paul wrote:
I think we are refering to percentages. "number" in E should properly refer to the difference in percentages in both years.

When you have percentages, fraction, numbers, etc dont you look at the subject of the "percentage/fraction, number" to determine whether its singular or plural? See this link:

http://www.gmatclub.com/phpbb/viewtopic.php?t=14792

With the above logic in mind why cant "those" in C refer to adults?

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GMAT Club Legend
Joined: 07 Jul 2004
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31 Aug 2005, 05:26
(A) doubling those reported in the 1977 survey
- Out. 'doubling those' is unidiomatic

(B) to double the number the 1977 survey reported
- awkward

(C) twice those the 1977 survey reported
- 'those' refers to the adults here, illogically

(D) twice as much as those reported in the 1977 survey
- same problem as C

(E) twice the number reported in the 1977 survey

E is the best choice.

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Senior Manager
Joined: 13 Jan 2005
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01 Sep 2005, 03:27
E. E reflects the correct comaprison b.w numbers.

GA

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Director
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01 Sep 2005, 18:37
Okay. i dont think anyone has answered my question. why cant "those" refer to adults and we are doing a correct comparsion of "adults" in 79 and 77.

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Intern
Joined: 09 Sep 2005
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10 Sep 2005, 08:44
Example The car stopped, making me late.
First clause indicates that there is some action which results in my late arrival. Thus there is cause and effect relation.
Choice a is wrong based on above explanation. There is no cause and effect relation which will double the numbers.

Choice B is awkward at best and unidiomatic at worst as it shows that "to double" is indicating towards the subject which is 20% of young adults.

Choice C Example: Do we say that "twice the number of crimes reported?"
or "twice crimes reported?". Always try the phrases in small sentences to see whether it makes sense or not?

Choice D It is unidiomatic to use twice and as many as together as both are used to indicate the comparision because as many as indicates equal to whereas twice indicates doubling the number.

Choice E is without any flaws.

In case of any comments, please feel free to post.

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10 Sep 2005, 08:44
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# According to surveys by the National Institute on Drug

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