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# Certain instruments used in veterinary surgery can be made

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Certain instruments used in veterinary surgery can be made [#permalink]

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28 Jul 2008, 15:29
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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.
[Reveal] Spoiler: OA
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Re: CR: Instruments [#permalink]

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28 Jul 2008, 17:24
I would say B.
Just looking at the numbers there is no way that more energy was used per sterilization vs total energy to manufacture all nylon instruments.
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 02:55
choice B states the opposite (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), and therefore CANNOTbe true

Guys - On what basis would you strike out E and C. I chose not to pick them as they were lacking support. What are your thoughts? Just wanted to make sure that I was thinking straight. .........Thanks!
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 05:13
I actually chose E - because the passage makes no mention of costs.

What's the OA?
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 05:31
I dont think E would qualify for this particular question since it is asking for something that is NOT true. I believe you'd have to pick an option that is not true based on the information provided. B states the opposite of what is stated in the argument and appears to be the best option. I could be totally off base though:)

Let's wait for the OA and then decide!
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 06:03
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 08:48
I went with D too.
A is true based on passage
B is out of scope since no information about the energy for each complete sterilization
C is also out because no info on total number of instruments
D Is FALSE.
E is again out because cost is not mentioned.

Let us know the OA
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 08:50
Gotcha.

vksunder wrote:
I dont think E would qualify for this particular question since it is asking for something that is NOT true. I believe you'd have to pick an option that is not true based on the information provided. B states the opposite of what is stated in the argument and appears to be the best option. I could be totally off base though:)

Let's wait for the OA and then decide!
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 09:13
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.

Will go with B)
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 10:05
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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.

b) More energy was required for each complete sterilization of the nylon instruments than was required to manufacture the nylon instruments.

10 complete sterilizations of set --> 3.4 time amount of energy for manufacture set ..
1 complete sterilizations of set -> 0.34 time amount of energy for manufacture set ..

Argument clearly disapprove B..
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Last edited by x2suresh on 29 Jul 2008, 10:13, edited 3 times in total.
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 10:08
I actually chose E - because the passage makes no mention of costs.

What's the OA?

The total cost of 50 complete sterilizations of the stainless steel instruments was greater than the cost of manufacturing the stainless steel instruments.

This can be true or can't be true.. we are not 100% sure.
(other costs.. like raw material cost, operating cost.. other factors too..)
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Last edited by x2suresh on 29 Jul 2008, 10:09, edited 1 time in total.
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 10:09
There is no OA. Sorry.
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 10:16
x97agarwal wrote:
There is no OA. Sorry.

I googled and found that OA is B.

http://www.beatthegmat.com/17-t14749.html
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 10:24
Is this a GMAT/LSAT question. Any idea?
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Re: CR: Instruments [#permalink]

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29 Jul 2008, 10:29
vksunder wrote:
Is this a GMAT/LSAT question. Any idea?

Sorry I don't know
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Re: CR: Instruments [#permalink]

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08 Sep 2010, 05:42
IMO that's a terrible question. Can anybody pls cite the source?
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Re: CR: Instruments [#permalink]

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08 Sep 2010, 06:00
Seriously there is no way to tell if even C is wrong I mean how do we know how many instruments were produced???
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Re: CR: Instruments [#permalink]

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08 Sep 2010, 06:33
B is the only one that can be disproved, by calculations as well, as x2suresh stated.
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Re: CR: Instruments [#permalink]

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08 Sep 2010, 12:29
kidchaos wrote:
Seriously there is no way to tell if even C is wrong I mean how do we know how many instruments were produced???

The question only asks what COULD be true. C COULD still be true after the passage's quoted study.
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Re: CR: Instruments [#permalink]

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08 Sep 2010, 18:14
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the approach that I took is to determine what could be definitely contrary to the info stated in the question. as mentioned before, cost to sterilize nylon inst's is 0.34 times of the cost to mnf given the data.
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Re: CR: Instruments   [#permalink] 08 Sep 2010, 18:14

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# Certain instruments used in veterinary surgery can be made

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