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Each December 31 in Country Q, a tally is made of the [#permalink]
11 May 2005, 21:51
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Each December 31 in Country Q, a tally is made of the countryâ€™s total available coal suppliesâ€”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.
The answer should be 'B'. Assuming available coal in 1990 was 100 kg. according to the statement available coal in 1991 must be less than 100 i.e 95. So that means that not only the coal mined in 1991 was consumed but also some of the coal available from previous year 1990 was consumed.
Only B fits the statements given in the argument. If more coal was consumed in 1991 than the amt of coal mined in that year, then the total available coal supply would be less than 1990. (since the definition of the total amt is the am to coal mined but not consumed)
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