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herogmat
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Post subject: double vs twice  Posted: Tue Jul 14, 2009 9:49 pm |
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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
What is the approach to choose between 'double' and 'twice' ?
How to choose between C and E ?
--hg
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mangipudi
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Post subject: Re: double vs twice Posted: Wed Jul 15, 2009 4:54 am |
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> What is the approach to choose between 'double' and 'twice' ?
'Double the number' and 'twice the number' are both valid.
However, the answer choice with double the number has other problems.
> How to choose between C and E ?
(C) twice those the 1977 survey reported
'Those' refers to 'young men'. You cannot have 'twice young men'. You have 'twice the number of young men' .
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selva.e
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Post subject: Re: double vs twice Posted: Wed Jul 15, 2009 11:15 am |
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Twice is always used for comparison.
For example,
USA has roughly twice as many people as India (does).
Whereas, double is mostly used as adjective/noun/participle
The number of people flying first class on domestic flights rose sharply in 1990 , doubling the increase of the previous year.
doubling the increase of
doubling that of the increase in
double as much as the increase of
twice as many as the increase in
twice as many as the increase of
Hope you got it!!
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d_taneja
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Post subject: Re: double vs twice Posted: Sat Jul 18, 2009 2:49 am |
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In C and E--> E is correct because in C it says that "twice those the 1977 survey reported" Two error..first one that it is not parallel with "in 1977" before comma
2nd it can not be twice of young adults but it can be twice the no of those surveyed in 1977
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esledge
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Post subject: Re: double vs twice Posted: Tue Sep 15, 2009 5:58 pm |
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d_taneja wrote: In C and E--> E is correct because in C it says that "twice those the 1977 survey reported" Two error..first one that it is not parallel with "in 1977" before comma
2nd it can not be twice of young adults but it can be twice the no of those surveyed in 1977 The parallelism you see between "in 1977" and "in 1979" might be false parallelism. That is, I think you don't really need "in...in" parallelism to have a correct answer. For example, I think the following sentence would be OK: According to a 1979 survey by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine that year, twice the number reported in the 1977 survey. However, the "in" split between C and E is significant for another reason: (C) "...the 1979 survey reported..." makes the survey the subject of the verb reported. There's a logical flaw--surveys don't report. People can report, using survey data. (E) "...reported (by someone) in the 1977 survey..."
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Emily Sledge
Instructor
ManhattanGMAT
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herogmat
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Post subject: Re: double vs twice Posted: Mon Sep 21, 2009 3:55 am |
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khandelwal_mayank
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Post subject: Re: double vs twice Posted: Fri Jun 24, 2011 5:48 pm |
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Hey I chose D as an answer.
Can someone explain why E is better than D
I thought that number is not the same as percentage so eliminated E
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gmat.cracker24
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Post subject: Re: double vs twice Posted: Sun Jun 26, 2011 2:45 pm |
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I guess for percentage vs. number debate, a analogy that i can think off is :
Country's GDP has increased by 50%, a number previously thought unlikely.
I believe if the GDP rises from 7% to 14% , the phrase set off by commas modifies 14.
However for D "those" seems a issue
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jnelson0612
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Post subject: Re: double vs twice Posted: Fri Jul 15, 2011 1:38 am |
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Can anyone provide the original source for this question?
_________________
Jamie Nelson
ManhattanGMAT Instructor
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gmatango
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Post subject: Re: double vs twice Posted: Wed Oct 12, 2011 9:16 am |
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jnelson0612
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Post subject: Re: double vs twice Posted: Sun Dec 11, 2011 10:55 pm |
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We still need to obtain an original source for this question, along with the original answer, before we discuss further.
_________________
Jamie Nelson
ManhattanGMAT Instructor
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ntr1989512
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Post subject: Re: double vs twice Posted: Mon May 07, 2012 11:27 am |
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jnelson0612 wrote: We still need to obtain an original source for this question, along with the original answer, before we discuss further. the source come from prep! in addition, i was stuck by E, since i remember ron say the form of "twice as many\much as" can only modify the noun that comes immediately before the comma. and in E "twice the number reported in the 1977 survey" is followed by "in 1979", so "twice the..."should modify 1979. it doesn't make sense. so why E is right? ron wrote: if you're going to say COMMA + "twice as many as...", then that's incorrect unless there's actually a quantity in front of the comma.
e.g.
last year i read 40 books, twice as many as i read in the preceding year
--> correct
last year the number of books i read increased dramatically, twice as many as i read in the preceding year
--> incorrect. & ron wrote: here's the basic idea:
if you say "twice as many", then this construction should be paired with a countable noun.
e.g., twice as many dogs --> "dogs" is a countable noun
if you said "twice as much", then this construction should be paired with an uncountable noun.
e.g., twice as much water --> "water" is an uncountable noun
if the noun in question is already an explicitly numerical quantity, then you should use neither "much" nor "many". instead, you should just use "twice" or "double" by itself.
e.g., twice the increase --> "increase" is an explicitly numerical quantity
these rules are followed pretty closely.
so, for instance:
twice as much water --> correct, since "water" is an uncountable noun (but is not an explicitly numerical quantity)
twice the water... --> incorrect, since water is not a numerical quantity
twice as much as the increase... --> incorrect; redundant
twice the increase... --> correct.
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ntr1989512
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Post subject: Re: double vs twice Posted: Wed May 23, 2012 10:29 am |
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i very sorry to dig out this thread, becasue i think every master in MANHATTAN omit this thread..hope your answer.thanks
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nhsumon_loll
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Post subject: Re: double vs twice Posted: Wed May 23, 2012 11:41 am |
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my choice is E...caz in option C it mislead the comparison where as in option E it makes clear...
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