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

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Each December 31 in Country Q, a tally is made of the [#permalink]

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07 Oct 2006, 03:24
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Each December 31 in Country Q, a tally is made of
the countryâ€™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.

I got the correct answer, but just wondering if the solution strategy I used is acceptable. Is there an implied assumption that Country Q must have relied on its reserves from the previous year (not stated anywhere in the passage), or should we use another formal logic pattern to deduce the difference between the amount mined/consumed between the two years?
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Re: CR Implied assumption type [#permalink]

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07 Oct 2006, 04:30
GMATT73 wrote:
Each December 31 in Country Q, a tally is made of
the countryâ€™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.

I got the correct answer, but just wondering if the solution strategy I used is acceptable. Is there an implied assumption that Country Q must have relied on its reserves from the previous year (not stated anywhere in the passage), or should we use another formal logic pattern to deduce the difference between the amount mined/consumed between the two years?

B is my answer.

The sentence "a tally is made of the countryâ€™s total available coal supplies" in the argument makes us to take into consideration coal remained from previous years.
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07 Oct 2006, 05:02
Caught between B and D. Though B is very close ...

IMHO D seems better...

D also says that consumption of mine in 1990 is lower than 1991 and
(so my Assumption - production of mine is comparatively less in 1991 and so the normal consumption in 1991 could cause the given result)
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Re: CR Implied assumption type [#permalink]

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07 Oct 2006, 06:27
ak_idc wrote:
GMATT73 wrote:
Each December 31 in Country Q, a tally is made of
the countryâ€™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.

I got the correct answer, but just wondering if the solution strategy I used is acceptable. Is there an implied assumption that Country Q must have relied on its reserves from the previous year (not stated anywhere in the passage), or should we use another formal logic pattern to deduce the difference between the amount mined/consumed between the two years?

B is my answer.

The sentence "a tally is made of the countryâ€™s total available coal supplies" in the argument makes us to take into consideration coal remained from previous years.

I concur!
This year's tally = last year's + newly mined coal- newly consumed coal ( since there's no foreign trade) ...as B states, newly mined coal < newly consumed coal ---> last year's tally > this year's

straight B.

Nice CR, Matt...please post more of this kind
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Re: CR Implied assumption type [#permalink]

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07 Oct 2006, 06:44
@ak_idc

Therefore, we must assume that country Q relied on 1990 excess coal reserves to satisfy 1991 consumption demands, right? This is where one begins to wonder if the test writers are starting to make us really think beyond the the facts in the passage and rely on unstated implied assumptions (AKA outside knowledge).

The only other possibility would be if Country Q switched to another heating fuel to supplement the shortage in 1991.

OK Laxie, on your request I'll try to post more CRs from this source.
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Re: CR Implied assumption type [#permalink]

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07 Oct 2006, 08:24
GMATT73 wrote:
@ak_idc

Therefore, we must assume that country Q relied on 1990 excess coal reserves to satisfy 1991 consumption demands, right? This is where one begins to wonder if the test writers are starting to make us really think beyond the the facts in the passage and rely on unstated implied assumptions (AKA outside knowledge).

The only other possibility would be if Country Q switched to another heating fuel to supplement the shortage in 1991.

OK Laxie, on your request I'll try to post more CRs from this source.

yeah..that seems to be the case. That makes the question more difficult to answer under time pressure. What is the source of this question, MATT?
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07 Oct 2006, 08:25
Clear B.
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Re: CR Implied assumption type [#permalink]

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07 Oct 2006, 14:06
B

surplus_1991 = Coal_mined_1991 - Coal_consumed_1991 + surplus_1990

if surplus_1991 < surplus_1990 then (Coal_mined_1991 - Coal_consumed_1991) has to be negative which means that the amt consumed was more than was mined
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07 Oct 2006, 15:32
B too, assuming surplus in 1990 then if we have less than this surplus at end of 91 then we must have consumed more than produced.
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08 Oct 2006, 22:29
Narrowed down to B and D.

D is out 'cause you need to make an added assumption that the amount of coal mined in 1990 and 1991 is the same.

B remains
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09 Oct 2006, 06:28
B is good.
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09 Oct 2006, 07:26
I chose B since it fits better than other choices. It's obvious answer.
09 Oct 2006, 07:26
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# Each December 31 in Country Q, a tally is made of the

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