more than, double, twice : GMAT Sentence Correction (SC)
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# more than, double, twice

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14 Sep 2009, 10:32
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Hi all,

Could anybody shed some light with the double, twice, etc. stuff?

Thanku all,
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Re: more than, double, twice [#permalink]

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17 Sep 2009, 17:36
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Re: more than, double, twice [#permalink]

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04 Oct 2009, 18:09
They're used in different idiomatic constructions, e.g. 'double the price', 'twice as much as', etc. If you have a specific example of what you're struggling with, we'll be able to provide a more detailed feedback.
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Re: more than, double, twice [#permalink]

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21 Feb 2010, 09:21
I also need some help with this: when is "double" proper to us and when is "twice" proper to use? Are there specific grammatical rules for each of these? It isn't mentioned in the Manhattan SC book. Thanks.

I'm not looking for an answer for the following, but here is an example of "double" vs. "twice":
Today, because of improvements in agricultural technology, the same amount of acerage produces double the apples that is has in 1910.
A) ...
B) twice as many apples as it did
C) as much as twice the apples it has
D) two times as many apples as there were
E) a doubling of the apples that it did
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Re: more than, double, twice [#permalink]

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24 Feb 2010, 11:31
Please, some light with this issue...
Thanks.
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Re: more than, double, twice [#permalink]

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24 Feb 2010, 13:21
twice is normally used with "as many as", but it is also idiomatic to say "twice the number" ... "twice the figure"... etc.

double is used more as a verb or -ing (participle or gerund/noun). e.g.:
The population doubled to 10k. (you wouldn't say the population twice to 10k).
The population is now 10k, doubling the population last year.
The population is now 10k, doubling that of last year.
The population is now 10k, doubling last year's.

The trick with these twice/double types of questions is not to contemplate over which one is preferred... but rather to look at the other words surround them... and find holes and errors in the other answer choices... POE (process of elimination).
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Re: more than, double, twice [#permalink]

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24 Feb 2010, 13:49
also,
i just want to add that when you encounter a double/twice as many as question, you have to make sure to check your parallelism... make sure you're comparing apples to apples, comparing the correct prepositional phrase to prep phrase, or noun to noun, simple gerund to simple gerund, etc. and that the comparison is logical.
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Re: more than, double, twice   [#permalink] 24 Feb 2010, 13:49
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