To develop more accurate population forecasts, demographers : GMAT Sentence Correction (SC)
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# To develop more accurate population forecasts, demographers

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Joined: 15 Jul 2010
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To develop more accurate population forecasts, demographers [#permalink]

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19 Nov 2010, 21:08
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84% (01:29) correct 16% (00:18) wrong based on 37 sessions

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To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economic
[Reveal] Spoiler: OA

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Last edited by scheol79 on 20 Nov 2010, 12:55, edited 1 time in total.
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Current Student
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Re: To develop more accurate population forecasts.... [#permalink]

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19 Nov 2010, 21:19

I have a question about comparison.

D. would have to know a great deal more than they do now about the social and economic.
Why do we need 'they do' here? OE explains that 'now' can be falsely compared to the knowledge, but do we need that clarification?
If we do wouldn't two examples below be wrong too?

Below two passages are considered correct.
Obesity is more common among American teenagers now than ever before. (o)
We have more engines that are efficient than before. (o)

If above two examples with before are considered correct, wouldn't E be correct to?
E. would have to know a great deal more than now about the social and economic

Are now and before considered different? Both now and before represent time to me.

Let's say now and before are indeed different, then would below be correct?
E. would have to know a great deal more than before about the social and economic

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Re: To develop more accurate population forecasts.... [#permalink]

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20 Nov 2010, 07:27
it should be D - you need a "would" in this sentence. The development is a future event, an unreal situation... you need a "would" to account for that

also you need "than they do now"; if you just leave it at "than now" then its comparing "now" with "know" (quite literally) which can't be right
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Re: To develop more accurate population forecasts.... [#permalink]

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20 Nov 2010, 09:43
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic - compares knowing with present time , "now"
B. have to know a great deal more than they do now about the social and economical - economical is inappropriate
C. would have to know a great deal more than they do now about the social and economical- economical is inappropriate
D. would have to know a great deal more than they do now about the social and economic - correct option
E. would have to know a great deal more than now about the social and economic compares knowing with present time , "now"

Obesity is more common among American teenagers now than ever before. - compares obesity now & obesity ever before. What are the other options? If "Obesity is more common among American teenagers now than it was ever before" then it will be the best option.
For second sentence also if "We have more engines that are efficient than we had before." - was among the choices then that should be the correct option.
We need to work with only the options given to us.
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Re: To develop more accurate population forecasts.... [#permalink]

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21 Nov 2010, 05:54
A nice and more comprehensive explanation can be found here:

sc-to-develop-more-accurate-population-forecasts-54658.html#p821516
Current Student
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Re: To develop more accurate population forecasts.... [#permalink]

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21 Nov 2010, 08:24
Werewolf wrote:
A nice and more comprehensive explanation can be found here:

sc-to-develop-more-accurate-population-forecasts-54658.html#p821516

Just note that answer choice E is different.
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Re: To develop more accurate population forecasts.... [#permalink]

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21 Nov 2010, 17:39
scheol79 wrote:
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economic

The Trap or trick to confuse test taker is that, choice B and C tried to match "Social" with "economical" which is wrong beause adding this "al" does not make it right. Social and economic are the right words to use as a combination.
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Re: To develop more accurate population forecasts.... [#permalink]

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21 Nov 2010, 20:48

Would shld be used as its forecast
social and economic is correct usage
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Re: To develop more accurate population forecasts....   [#permalink] 21 Nov 2010, 20:48
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