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02 Sep 2019, 05:20
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
69% (01:52) correct
31%
(01:57)
wrong
based on 300
sessions
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Taaffeite costs more per ounce than painite. But since plutonium costs more per ounce than platinum, it follows that taaffeite costs more per ounce than platinum.
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
A. Plutonium costs more per ounce than taaffeite.
B. Taaffeite and plutonium cost the same per ounce.
C. Painite and plutonium cost the same per ounce.
D. Painite costs more per ounce than platinum.
E. Painite costs more per ounce than plutonium.
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
A. Plutonium costs more per ounce than taaffeite.
B. Taaffeite and plutonium cost the same per ounce.
C. Painite and plutonium cost the same per ounce.
D. Painite costs more per ounce than platinum.
E. Painite costs more per ounce than plutonium.
Source: GMAT Free (16)
02 Sep 2019, 11:03
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SajjadAhmad
Taaffeite > painite ; plutonium > platinum
So, Taaffeite > platinum (Main Conclusion)
(A) plutonium > platinum > Taaffeite (Refutes main conclusion)
(B) Taaffeite > painite ;
___plutonium > platinum (Can be concluded)
(C) Taaffeite > painit = plutonium > platinum (Can be concluded)
(D) Taaffeite > painite > plutonium > platinum (Can be concluded)
(E) Taaffeite > painite > plutonium > platinum (Can be concluded)
Hence, Answer must be (A)
04 Sep 2019, 06:06
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SajjadAhmad
Official Explanation
Reading the question: we have some fragments of logical reasoning here. Alternatively, we can view them as mathematical equations expressed in words. We will write them as equations with variables:
T > Pain; and
Plu > Pla;
therefore: T > Pla
The most obvious way to add the missing piece is to establish Pain > Plu, connecting the two statements. That's answer choice (E). But this is an EXCEPT question, so that means (E) is out, not in. We go through the others. (A) says that Plu > T. That doesn't immediately seem to work, so we skip it. How about (B)? (B) gives T = Plu. Then we can substitute. (B) works and so it's out. (C) gives Pain = Plu. Again we can substitute and obtain success, so (C) is out. (D) says Pain > Pla. T is greater than something that is greater than Pla. So (D) works.
The correct answer is (A).
