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# Certain instruments used in veterinary surgery can be made

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Intern
Joined: 08 Aug 2011
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Schools: Rotman, Ivey

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17 Sep 2012, 05:43
x97agarwal wrote:
Certain instruments used in veterinary surgery can be made either of stainless steel or of nylon. In a study of such instruments, 10 complete sterilizations of a set of nylon instruments required 3.4 times the amount of energy used to manufacture that set of instruments, whereas 50 complete sterilizations of a set of stainless steel instruments required 2.1 times the amount of energy required to manufacture that set of instruments.

If the statements above are true, each of the following could be true EXCEPT:

(A) The 50 complete sterilizations of nylon instruments used more energy than did the 50 complete sterilizations of the stainless steel instruments.
(B) More energy was required for each complete sterilization of the nylon instruments than was required to manufacture the nylon instruments.
(C) More nylon instruments than stainless steel instruments were sterilized in the study.
(D) More energy was used to produce the stainless steel instruments than was used to produce the nylon instruments.
(E) The total cost of 50 complete sterilizations of the stainless steel instruments was greater than the cost of manufacturing the stainless steel instruments.

[Reveal] Spoiler: Kaplan OE

Let me try explaining this ...

Equation 1 says:
10 Sterilizations = 3.4 (Manufacturing of Nylon group)
or 1 Sterilizations = .34 (Manufacturing of Nylon group)
or 1 Sterilizations = 34% (Manufacturing of Nylon group)

Equation 2 says:
50 Sterilizations = 2.1 (Manufacturing of Steel group)
or 1 Sterilizations = 2.1/50 (Manufacturing of Nylon group)
1 Sterilizations = 4% (Manufacturing of Nylon group)

That's all we know. No relationship between the cost of Nylon and Steel group defined. Neither their number is certain.

A) As stated above, we don't know this relation so no comments.
C) As stated above, we don't know this relation so no comments.
D) As stated above, we don't know this relation so no comments.
E) Yes, we know this is true from equation 2. If 50 Sterilizations equals 2.1 times Manu, then 50 S must be bigger than 1 times Manu for sure ..

Correct Answer: B) In case of Nylon, the option suggests 1 S > 100% Manu; however, we know that 1 S just equals 34% manu and cant be bigger than that.
B.T.W it took me more than 5 mins to get to this result so don't worry if you couldn't see this outright ..

If you like my post, kudos me .. this will be my 1st and I need 25 of them for GC tests access !
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15 Sep 2013, 19:38
As per the passage 10 Nylon sterilizations = 3.4 ( Cost of manufacturing one set of nylon instruments ) .

Therefore 1 Nylon sterilization = 0.34 ( Cost of manufacturing one set of nylon instruments ) .
Hence Goes against B !!
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19 Sep 2013, 11:14
I have chose E because the passage do not mention costs at all... But you were right, the question ask for something that is NOT true and only choic B is wrong (opposite of what it should be)!
_________________

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26 Nov 2013, 09:08
+1 for B....

Whats the source of this question?
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28 Aug 2014, 08:51
Based on the info given in the passage, we can create a table like shown below.

Energy used to manufacture:
Nylon = N and SS = S
Energy used to Sterilize each set:
Nylon = (3.4 x N)/10
SS = (2.1 x S)/50

Question asks for "What could be true EXCEPT"

Answer choice B states that (3.4 x N)/10 > N which is mathematically incorrect. Thus B can never be true and the answer.
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29 Mar 2015, 11:47
OA is B but my take was D.
Can anyone explain why not D?
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07 May 2015, 06:49
x97agarwal wrote:
Certain instruments used in veterinary surgery can be made either of stainless steel or of nylon. In a study of such instruments, 10 complete sterilizations of a set of nylon instruments required 3.4 times the amount of energy used to manufacture that set of instruments, whereas 50 complete sterilizations of a set of stainless steel instruments required 2.1 times the amount of energy required to manufacture that set of instruments.

If the statements above are true, each of the following could be true EXCEPT:

(A) The 50 complete sterilizations of nylon instruments used more energy than did the 50 complete sterilizations of the stainless steel instruments.
(B) More energy was required for each complete sterilization of the nylon instruments than was required to manufacture the nylon instruments.
(C) More nylon instruments than stainless steel instruments were sterilized in the study.
(D) More energy was used to produce the stainless steel instruments than was used to produce the nylon instruments.
(E) The total cost of 50 complete sterilizations of the stainless steel instruments was greater than the cost of manufacturing the stainless steel instruments.

[Reveal] Spoiler: Kaplan OE
Official LSAT Test Prep 9, Section 2, Q-17
(B) If this one reminded you of a logic game, so much the better: Your LG skills serve
you well here. First, note that the question asks for the one thing that cannot be true. Next,
draw out the information the stimulus gives — and doesn’t give. There are two sets of
instruments; the same procedures are done to each; and the procedures yield similar
results. It takes more energy to sterilize a set of these instruments than it does to
manufacture them. But we don’t know how many instruments make up each set, nor do
we know exactly how much energy it takes to manufacture either set. It could take more to
make nylon tools, or it could take more to make stainless steel, or it could take equal
amounts of energy for both. We just don’t know. Unfortunately there’s no way to predict
the answer here. It’s just a matter of slogging through the choices until you find the right
one.
(A) could be true. If the same amount of energy was required to manufacture both the
nylon and the steel instruments, then sterilizing the nylon instruments would have been
more energy consuming than sterilizing the steel. (B), however, can’t be true, and yes, it
takes a little math-thinking, but that’s life. (You could have skipped this choice and
checked out the others; if all of them can be true, then (B) must be correct whether or not
you understand why.) If 50 complete sterilizations of the nylon instruments took 3.4 times
the energy to make that set, then they should be able to do roughly 15 sterilizations with
the same energy as manufacture. One complete sterilization, then, must have taken far less
than the energy of manufacture. (C) could be true; as we noted above, we don’t know how
many types of instrument appear in each kit, so there could be more nylon instruments
than steel. Since both kits were sterilized an equal number of times, more nylon
instruments could have been sterilized. (D) absolutely could be true, since we don’t know
how much energy was required to produce either set. (E) is also quite possible. If
materials are cheap, and energy is very expensive, then using far more energy to sterilize
than manufacture steel instruments could make sterilizing them more expensive than
making them in the first place.

In this 'except' kind of questions,best answer could be something that is not even mentioned in stimulus.I think both "costs" (e) and instruments "b" are not mentioned.
On what basis we have eliminated E?
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11 May 2015, 05:40
Chose B even though not fully convinced.
But other choices were eliminated only choice left was B
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08 Jul 2015, 21:44
If you don't get (B) right away, you will most likely boil it down to (B) and (C).

(B) Sterilization per nylon instrument > total energy on manufacturing nylon instruments. Not true.

(C) Although they do mention only 10 nylon and 50 stainless steel instruments, it doesn't imply that only 10 nylon and only 50 stainless steel instruments were studied. The statement can be read as, "for every 10" or "for every 50". They merely state a ratio. So, it is possible that more nylon instruments were tested in the study.
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13 Jul 2015, 09:27
IMO B.
Assuming that 100 units of energy is required to manufacture nylon instr., then each complete sterilization will amount to 0.34*100 = 34 units of energy. So B is definitely false and answer.
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13 Aug 2016, 04:21
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26 Dec 2016, 02:44
Good question. I would hope I could get this one if it wasn't so late at night
Re: Certain instruments used in veterinary surgery can be made   [#permalink] 26 Dec 2016, 02:44

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