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# The quality of unrefined olive oil is not actually defined

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The quality of unrefined olive oil is not actually defined [#permalink]

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19 Jul 2004, 10:17
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The quality of unrefined olive oil is not actually defined in terms of acidity, yet extensive tests have shown that the less free oleic acid an unrefined olive oil contains per liter, the higher its quality. The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil ' s acidity.

If the statements above are all true, which of the following conclusions is best supported by them?

A. When an olive oil is refined, the concentration of oleic acid in the oil is reduced.
B. The quality of an unrefined olive oil can be determined only by accurately measuring its acidity.
C. If an unrefined olive oil is intermediate in acidity between two other unrefined olive oils, it will also be intermediate between them in quality.
D. Free oleic acid is the only acid that unrefined olive oil contains.
E. People who judge the quality of unrefined olive oils actually judge those oils by their acidity, which the judges can taste.

I lean to C. What about you?

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19 Jul 2004, 13:10
A my FA

Reasons for eliminating other choices:

B--> makes an absolute kind of a statement. I eliminate this choice only based on the use of "ONLY" - usually such extreme words cannot be used by GMAT test makers, even if it is explicitly mentioned in the argument, because, as per Princeton, some fool might come up and say, well...I have a different method of determining quality!
C--> comes very close, but as quality of oil is NOT determined by acidity, this option cannot be true. The statement in the argument only tells us that if the acidity is less, the quality is better, but does not state that ONLY acidity is an indicator of quality. for instance, it is like saying the better the quality of fuel, the better a car runs. But if there is a problem in the engine itself, the car might not even run at all - even with the best of fuels!
D & E--> D is out, because of the use of "ONLY" and E, if I were to be the judge, probably my criteria would not be the same, so, this is out!

Hope I am correct in myt reasoning

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19 Jul 2004, 15:03
Tough one, I was torn between A and C.
I actually went with A
I think we can agree that E,D, can be tossed out.

B is wrong b/c the fist sentence states that there are other reasons besides the acidity of oil that determine its quality. Beware whenever you see extreme words like 'only' in GMAT choices.

Quality of oil is not defined by acidity, so C is out.

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19 Jul 2004, 18:16
I will go with D.

A-is out since the definition of refining oil has not been discussed. It could
either increase or decrease the volume of acid per unit volume of oil.

B-the stem never mentions that acidity is the only measure of quality.
it only says that quality is inversely proportional to the acidity.

C-again C can't be concluded since acidity is not the sole factor.

E-u know why it's wrong.

D- the stem says that "The proportion of free oleic acid that an olive oil contains is an accurate measure of the oil ' s acidity.". That means that
it's the only acid found in olive oil. Hence D.

shoonya
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19 Jul 2004, 20:30
C sound safer but I'm leaning to E. I'll explain if I'm right.
Boksana, plz don't post your choice in the first post.
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20 Jul 2004, 00:30
My answer is C, if I'm right I will explain

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20 Jul 2004, 01:28
Yes, I'm sure it's C

Let A, B and C designate the three types of unrefined oil we are comparing. We know that

acidity(A) < acidity(B) < acidity(C)

Because "proportion of free oleic acid that an olive oil contains is an accurate measure of the oil's acidity" we can conclude that

proportion of oleic acid in A < proportion of oleic acid in B < proportion of oleic acid in C

Because "the less free oleic acid an unrefined olive oil contains per liter, the higher its quality" we can conclude that

quality(C) < quality(B) < quality(A)

So, B is intermediate between A and C in quality

I agree with Vithal and Lastochka that the quality of oil IS NOT DEFINED BY ACIDITY but we do not need to presuppose that. The passage establishes a CORRELATION between the proportion of oleic acid and the quality and THAT IS ALL WE NEED

Please, tell me if you think I'm wrong

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20 Jul 2004, 05:23
I picked (C) as well.
And I think it should be the right answer.

Assume Acidity of Oil1 = 5 unit.
Acidity of Oil2 = 3units
Oil3 = 1unit

oil1>oil2>oil3

And as per the question the quality will be in order

oil1<oil2<oil3

Anyways! oil2 is always in between oil1 and oil3.
(Boy the day is good today! I feel I am doing good with CR's today!)

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20 Jul 2004, 19:00
OA plzzz
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22 Jul 2004, 01:47
boksana

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22 Jul 2004, 12:16
As per boksana, there is no OA to this - so - we got to fight it out among ourselves

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22 Jul 2004, 18:55
Thanks Vithal for your care Indeed, I have no OA

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22 Jul 2004, 18:55
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