LSAT 140 – Section 1 – Question 17

LSAT 140 - Section 1 - Question 17

December 2013

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT140 S1 Q17
+LR
Must be true +MBT
Conditional Reasoning +CondR
A
1%
156
B
79%
166
C
1%
154
D
1%
153
E
18%
160
139
150
161
 +Medium 148.137 +SubsectionMedium

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If a motor is sound-insulated, then it is quiet enough to use in home appliances. If a motor is quiet enough to use in home appliances, then it can be used in institutional settings. None of the motors manufactured by EM Industries are quiet enough to use in home appliances.

Summary
The stimulus can be diagrammed as follows:

Notable Valid Inferences
If a motor is sound-insulated, it can be used in institutional settings.
No motors manufactured by EM Industries are sound-insulated.
Some motors that can be used in institutional settings are not manufactured by EM Industries.

A
If a motor can be used in institutional settings, then it is sound-insulated.
Could be false. While we know that every sound-insulated motor can be used in institutional settings, we do not know whether every motor that can be used in institutional settings is sound-insulated. (A) confuses the necessary and sufficient conditions.
B
None of the motors manufactured by EM Industries are sound-insulated.
Must be true. As shown below, by chaining the conditional claims, we see that “not made by EM Industries” is a necessary condition of “sound-insulated”.
C
At least some of the motors manufactured by EM Industries can be used in institutional settings.
Could be false. We know that some of the motors manufactured by EM Industries can’t be used in institutional settings, and it’s quite possible that all of them can’t!
D
If a motor is quiet enough to use in home appliances, then it is sound-insulated.
Could be false. While we know that every sound-insulated motor is quiet enough to use in home appliances, we do not know whether every motor quiet enough for home appliances is sound-insulated. (D) confuses the necessary and sufficient conditions.
E
None of the motors manufactured by EM Industries can be used in institutional settings.
Could be false. We know that some of the motors manufactured by EM Industries can’t be used in institutional settings, but it’s possible that some can. There might be sufficient conditions for institutional use other than sound-insulation.

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LSAT PrepTest 140 Explanations

Section 1 - Logical Reasoning

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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