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Each December 31 in Country Q, a tally is made of the

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VP
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Each December 31 in Country Q, a tally is made of the [#permalink] New post 14 Apr 2005, 06:01
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A
B
C
D
E

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Each December 31 in Country Q, a tally is made of the country’s total available coal supplies—that is, the total amount of coal that has been mined throughout the country but not consumed. In 1991 that amount was considerably lower than it had been in 1990. Furthermore, Country Q has not imported or exported coal since 1970.

If the statements above are true, which one of the following must also be true on the basis of them?

(A) In Country Q, more coal was mined in 1990 than was mined in 1991.

(B) In Country Q, the amount of coal consumed in 1991 was greater than the amount of coal mined in 1991.

(C) In Country Q, the amount of coal consumed in 1990 was greater than the amount of coal consumed in 1991.

(D) In Country Q, the amount of coal consumed in 1991 was greater than the amount of coal consumed in 1990.

(E) In Country Q, more coal was consumed during the first half of 1991 than was consumed during the first half of 1990.
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 [#permalink] New post 14 Apr 2005, 06:40
B.

If in Country Q, the amount of coal consumed in 1991 was greater than the amount of coal mined in 1991, the are no supplies or countrys total available coal supplies are zero. The stem says that "In 1991 that amount was considerably lower than it had been in 1990", which means that in 1990 there was a +ve figure of the countrys total available coal supplies.

A and D are also close but are partial as the total supply of coal is dependant on both factors, mining and consumption.
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 [#permalink] New post 14 Apr 2005, 07:05
(D) Inventories of coal in 1991 = inventories of coal in 1990 (A) + total coal mined in 1991 (B) - total coal consumed in 1991 (C)
If D is smaller than A, than B-C<0 which is C>B.
So total amount of coal consumed in 1991 is greater than the total coal mined in 1991.

Agree on B
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 [#permalink] New post 14 Apr 2005, 07:29
Interesting ques....however, my doubt was that the stem is not clear in its definition of "total available coal supplies". It says "that is, the total amount of coal that has been mined throughout the country but not consumed." It is not clear if this number is only for one year i.e. for 91 it will be coal mined only in 91 - coal consumed in 91 or is it the coal available in 91 (i.e. coal leftover from 90 + mined in 91) - coal consumed in 91. . If u assumed the former you can't reach a conclusion that matches with the choices.

Last edited by banerjeea_98 on 14 Apr 2005, 07:35, edited 1 time in total.
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 [#permalink] New post 14 Apr 2005, 07:31
yes, you're right, I had the same problem, but then no aswer is suitable.

Last edited by thearch on 14 Apr 2005, 08:52, edited 1 time in total.
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 [#permalink] New post 14 Apr 2005, 07:41
Interested in the OA - I was able to negate everything.

B cannot be it.


In 1991 let say Mined is 200 and Consumed is 100, so 1991's availabe coal will be 100.
In 1990 let say Mined is 300 and Consumed is 100, so 1991's availabe coal will be 200.

The above satisfies the terms mentioned, but does not satisfy B
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 [#permalink] New post 14 Apr 2005, 10:05
rthothad wrote:
Interested in the OA - I was able to negate everything.

B cannot be it.


In 1991 let say Mined is 200 and Consumed is 100, so 1991's availabe coal will be 100.
In 1990 let say Mined is 300 and Consumed is 100, so 1991's availabe coal will be 200.

The above satisfies the terms mentioned, but does not satisfy B


If u interpret the ques as thearch did i.e. available in 91 = available in 90 + mined in 91 - consumed in 91, then u will get "B", but as I said stem is not clear. You example is interpreting it another way, which is also valid as the stem doesn't specify.
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 [#permalink] New post 14 Apr 2005, 14:48
I will assume what thearch has assumed, take (B) as answer and proceed.
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 [#permalink] New post 14 Apr 2005, 15:25
banerjeea_98 wrote:
Interesting ques....however, my doubt was that the stem is not clear in its definition of "total available coal supplies". It says "that is, the total amount of coal that has been mined throughout the country but not consumed." It is not clear if this number is only for one year i.e. for 91 it will be coal mined only in 91 - coal consumed in 91 or is it the coal available in 91 (i.e. coal leftover from 90 + mined in 91) - coal consumed in 91. . If u assumed the former you can't reach a conclusion that matches with the choices.


agree, I was so confused that if the supply is calculated year by year, then there is no correct answer.

I will pick B on test
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 [#permalink] New post 14 Apr 2005, 17:10
I am not sure if this question is of GMAT quality. I am pretty positive that GMAT questions will not have such dubious questions.
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 [#permalink] New post 15 Apr 2005, 00:15
banerjeea_98 wrote:
Interesting ques....however, my doubt was that the stem is not clear in its definition of "total available coal supplies". It says "that is, the total amount of coal that has been mined throughout the country but not consumed." It is not clear if this number is only for one year i.e. for 91 it will be coal mined only in 91 - coal consumed in 91 or is it the coal available in 91 (i.e. coal leftover from 90 + mined in 91) - coal consumed in 91. . If u assumed the former you can't reach a conclusion that matches with the choices.


Hi, the premise is the second in your case.
From the passage, in 1991 that amount was considerably lower than it had been in 1990, which means two years both have leftovers.

And the OA is B, thanks
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 [#permalink] New post 15 Apr 2005, 04:43
rthothad wrote:
I am not sure if this question is of GMAT quality. I am pretty positive that GMAT questions will not have such dubious questions.


I'm glad i am not the only one who found it shady. that's why i skipped it because most of these dubious questions are really time consuming and distracting esepecially if what is being tested is no way related to what is likely to be tested on the GMAT
  [#permalink] 15 Apr 2005, 04:43
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