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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Senior Manager
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To develop more accurate population forecasts, demographers [#permalink]

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27 Mar 2010, 08:38
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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 economical

Pls. explain. Thanks..
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Re: Pls. explain this SC !! [#permalink]

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27 Mar 2010, 08:43
nsp007 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 economical

Pls. explain. Thanks..

Use of have correct hence neglecting choices C,D,E
in A this is incorrect "more than now about the" hence its B.
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Re: Pls. explain this SC !! [#permalink]

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27 Mar 2010, 09:49
economical determinant is wrong, economic is correct here
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Re: Pls. explain this SC !! [#permalink]

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27 Mar 2010, 10:25
I will go with D. Sounds complete to me. The sentence starts off in a subjunctive mood. To develop something more accurately, somebody would have to know more than they do now......There is a sense of "wish" than a "command", in the way the meaning is conveyed.
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Re: Pls. explain this SC !! [#permalink]

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27 Mar 2010, 11:51
Even i picked D, but OA is E !!
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Re: Pls. explain this SC !! [#permalink]

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28 Mar 2010, 00:01
nsp007 wrote:
Even i picked D, but OA is E !!

E cannot be correct. So, don't fret over this, whatever the source of this question. For one, the usage of 'economical' in e is obviously wrong, as many others have already pointed out. Moreover, it is not a parallel comparison structure ("..great deal more than now..").
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Re: Pls. explain this SC !! [#permalink]

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28 Mar 2010, 04:39
I will go with D too. However, I have a slightly different questions.

Why is it

would have to know a great deal more than they do now about the social and economic

rather than

will have to know a great deal more than they do now about the social and economic
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Re: Pls. explain this SC !! [#permalink]

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27 Jul 2010, 08:43
whats the difference between economic and economical?
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Re: Pls. explain this SC !! [#permalink]

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27 Jul 2010, 11:06
what is the OA? I narrowed it down to E and D- +1 for D
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Re: Pls. explain this SC !! [#permalink]

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27 Jul 2010, 17:34
D for me too.

economical means frugal
example: economical use of time

economic - relating to the science of economics
example: economic theory, economic growth
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Re: Pls. explain this SC !! [#permalink]

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27 Jul 2010, 19:08
As many have pointed out 'economical' is wrong and so that leaves us with A and D.. And A uses a wrong comparison. So D is right.

+1 for D
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Re: Pls. explain this SC !! [#permalink]

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27 Jul 2010, 20:24
Its D.
If the OA is being quoted from the paper based sets then its wrong. The correct answer is D.

This question is also there on the OG12 (Q41).
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Re: Pls. explain this SC !! [#permalink]

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28 Aug 2010, 04:49
According to Manhattan SC, economical means efficient, and that is what we want to say here, so Im with C.
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Re: Pls. explain this SC !!   [#permalink] 28 Aug 2010, 04:49
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