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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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12 Feb 2010, 04:14
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27% (01:08) correct 73% (01:42) wrong based on 18 sessions

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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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Re: LSAT CR : Country Q Coal [#permalink]

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12 Feb 2010, 04:27
B.
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Re: LSAT CR : Country Q Coal [#permalink]

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12 Feb 2010, 19:28
D) In Country Q, the amount of coal consumed in
1991 was greater than the amount of coal
consumed in 1990.

what is OA?
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Re: LSAT CR : Country Q Coal [#permalink]

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12 Feb 2010, 22:45
Though the OA is B, the question is confusing; Even A can be true
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Re: LSAT CR : Country Q Coal [#permalink]

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13 Feb 2010, 04:00
angel2009 wrote:
Though the OA is B, the question is confusing; Even A can be true

Can be true = false.

We are looking for must be true
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Re: LSAT CR : Country Q Coal [#permalink]

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13 Feb 2010, 07:19
I agree with (B)
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Re: LSAT CR : Country Q Coal [#permalink]

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13 Feb 2010, 19:30
angel2009 wrote:
Though the OA is B, the question is confusing; Even A can be true

I do not see any relevance of any of the options. This argument is about a 'delta'. The delta being coal mined minus coal consumed. So change in either of these 2 factors for the years 1990 and 1991 will cause the delta to move upward or downward. Neither of these options can be an answer since there are four factors which are influencing the delta.

Am i missing something? pls comment
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Re: LSAT CR : Country Q Coal [#permalink]

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14 Feb 2010, 12:53
tenaman10 wrote:
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.

This is indeed a tough question. But only B will make sense.

We need a statement where 'delta' i.e. production-consumption for 1990 is confirmed higher than that of 1991 i.e. delta(1990)> delta(1991).

A says that more coal was mined in 1990 than in 1991. But if the consumption was also more than that of 1991 then the 'delta' could be possibly lower than that of 1991.

C says that consumption of 1990 > consumption of 1991. But still no production figures are given. There could be a possibility that production for both the years was same. In that case delta(1990)< delta(1991).

D says that consumption(1991)> consumption(1990). Here again the production figures are not provided. What if production(1991) was much higher than that of production(1990). This would mean delta(1990)< delta(1991).

E is totally out of scope.

Only B makes sense. Why? Because, there was no import or export & if consumption(1991)>production(1991) then that implies that delta(1991)<0 i.e. -ve, because delta = prod - cons.

If delta is -ve & no imports were made then where did the extra coal came from? It came from the last years left over stock i.e. delta(1990). And if there were stocks left unconsumed in 1990 then that means that delta(1991)>0 i.e. +ve.

Now, Delta(1990)>0 & delta(1991)<0. Therefore, Delta(1990)>delta(1991). Hence, Proved. There is no other way in which Country Q consumed more than it produced.
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Re: LSAT CR : Country Q Coal [#permalink]

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14 Feb 2010, 14:12
honeyrai wrote:
tenaman10 wrote:

Only B makes sense. Why? Because, there was no import or export & if consumption(1991)>production(1991) then that implies that delta(1991)<0 i.e. -ve, because delta = prod - cons.

If delta is -ve & no imports were made then where did the extra coal came from? It came from the last years left over stock i.e. delta(1990). And if there were stocks left unconsumed in 1990 then that means that delta(1991)>0 i.e. +ve.

Now, Delta(1990)>0 & delta(1991)<0. Therefore, Delta(1990)>delta(1991). Hence, Proved. There is no other way in which Country Q consumed more than it produced.

Brilliant analysis.....it's not a purely verbal question!

But can this be solved in 1.30 mins? I would better skip this (i.e. guess an answer) and proceed.
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Re: LSAT CR : Country Q Coal [#permalink]

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14 Feb 2010, 14:31
siddhartho wrote:
Brilliant analysis.....it's not a purely verbal question!

But can this be solved in 1.30 mins? I would better skip this (i.e. guess an answer) and proceed.

Sure it can, less even. You don't have to do any math or draw up any formulas/diagrams as the whole questions revolves around a singular concept (delta). Once the concept is found the wrong answers are ruled out very quickly.

People on LSAT do it :D

The stimulus clearly shows a negative delta and an answer has to fit it. All answers besides B don't have to be true for the delta to hold, only B must be true.
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Re: LSAT CR : Country Q Coal [#permalink]

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16 Feb 2010, 01:52
I would go for B
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Re: LSAT CR : Country Q Coal [#permalink]

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04 Jul 2010, 11:48
honeyrai wrote:
tenaman10 wrote:
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.

This is indeed a tough question. But only B will make sense.

We need a statement where 'delta' i.e. production-consumption for 1990 is confirmed higher than that of 1991 i.e. delta(1990)> delta(1991).

A says that more coal was mined in 1990 than in 1991. But if the consumption was also more than that of 1991 then the 'delta' could be possibly lower than that of 1991.

C says that consumption of 1990 > consumption of 1991. But still no production figures are given. There could be a possibility that production for both the years was same. In that case delta(1990)< delta(1991).

D says that consumption(1991)> consumption(1990). Here again the production figures are not provided. What if production(1991) was much higher than that of production(1990). This would mean delta(1990)< delta(1991).

E is totally out of scope.

Only B makes sense. Why? Because, there was no import or export & if consumption(1991)>production(1991) then that implies that delta(1991)<0 i.e. -ve, because delta = prod - cons.

If delta is -ve & no imports were made then where did the extra coal came from? It came from the last years left over stock i.e. delta(1990). And if there were stocks left unconsumed in 1990 then that means that delta(1991)>0 i.e. +ve.

Now, Delta(1990)>0 & delta(1991)<0. Therefore, Delta(1990)>delta(1991). Hence, Proved. There is no other way in which Country Q consumed more than it produced.

This is crazy..i dont follow you...
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Re: LSAT CR : Country Q Coal [#permalink]

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04 Jul 2010, 11:57
honeyrai wrote:
tenaman10 wrote:
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.

This is indeed a tough question. But only B will make sense.

We need a statement where 'delta' i.e. production-consumption for 1990 is confirmed higher than that of 1991 i.e. delta(1990)> delta(1991).

A says that more coal was mined in 1990 than in 1991. But if the consumption was also more than that of 1991 then the 'delta' could be possibly lower than that of 1991.

C says that consumption of 1990 > consumption of 1991. But still no production figures are given. There could be a possibility that production for both the years was same. In that case delta(1990)< delta(1991).

D says that consumption(1991)> consumption(1990). Here again the production figures are not provided. What if production(1991) was much higher than that of production(1990). This would mean delta(1990)< delta(1991).

E is totally out of scope.

Only B makes sense. Why? Because, there was no import or export & if consumption(1991)>production(1991) then that implies that delta(1991)<0 i.e. -ve, because delta = prod - cons.

If delta is -ve & no imports were made then where did the extra coal came from? It came from the last years left over stock i.e. delta(1990). And if there were stocks left unconsumed in 1990 then that means that delta(1991)>0 i.e. +ve.

Now, Delta(1990)>0 & delta(1991)<0. Therefore, Delta(1990)>delta(1991). Hence, Proved. There is no other way in which Country Q consumed more than it produced.

OK, i agree. However, I think that B can be true (in the scenario you have pointed out), but but is not necessary to be true.
For example:

1990:
Production=11
Consumed=1
Delta=11
1991:
Production=7
Consumed=4
Delta=3

Delta(1990)>Delta(1991) without B being true.

Could anybody clarify?
Thanks,
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Re: LSAT CR : Country Q Coal [#permalink]

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31 Jul 2010, 20:40
b
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Re: LSAT CR : Country Q Coal [#permalink]

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01 Aug 2010, 06:15
it's easy

available in 1990>available 1991
which means the consumption of coal in 1991 exceeds the mining(production) of it.
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Re: LSAT CR : Country Q Coal [#permalink]

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01 Aug 2010, 19:43
went for B .......agree with Honeyrai
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Re: LSAT CR : Country Q Coal [#permalink]

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04 Aug 2010, 22:33
Noboru - you're assuming that the amount of coal available starts from zero at the beginning of each year. In that case, the amount of coal produced would ALWAYS be larger than the amount consumed. However, the question just says the total coal supplies. Well, If we started 1991 X coal supplies (x /= 0 ) then we need to get a number smaller than x. The only way that is possible if the amount consumed is larger than the amount mined for that year.
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Re: LSAT CR : Country Q Coal [#permalink]

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12 Sep 2010, 02:48
HOw do you know that more was consumed than was mined there is no info about mined coal at all in both years only abt coal not consumed
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Re: LSAT CR : Country Q Coal   [#permalink] 12 Sep 2010, 02:48
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