LSAT 117 – Section 3 – Question 18

LSAT 117 - Section 3 - Question 18

October 2004

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT117 S3 Q18
+LR
+Exp
Most strongly supported +MSS
Causal Reasoning +CausR
A
3%
161
B
31%
163
C
1%
155
D
3%
161
E
62%
168
149
160
172
 +Hardest 146.848 +SubsectionMedium

Until 1985 all commercial airlines completely replenished the cabin air in planes in flight once every 30 minutes. Since then the rate has been once every hour. The less frequently cabin air is replenished in a plane in flight, the higher the level of carbon dioxide in that plane and the easier it is for airborne illnesses to be spread.

Summary
Before 1985, all commercial airlines replaced the cabin air in a plane once every 30 minutes. After 1985, airlines replace the cabin air once every hour. The less frequently cabin air is replaced, the higher the level of carbon dioxide in the cabin air and the easier it is for airborne illnesses to spread.

Strongly Supported Conclusions
Modern airplanes have higher levels of carbon dioxide in the cabin air compared to planes before 1985.

A
In 1985 there was a loosening of regulations concerning cabin air in commercial airline flights.
This answer is unsupported. We don’t know from the stimulus what caused commercial airlines to replace the rate of replacement from every 30 minutes to every hour.
B
People who fly today are more likely to contract airborne illnesses than were people who flew prior to 1985.
This answer is unsupported. The stimulus is limited to what is true of commercial airlines. For this answer, you have to assume that people who fly today fly on commercial airlines.
C
Low levels of carbon dioxide in cabin air make it impossible for airborne illnesses to spread.
This answer is unsupported. “Impossible” is too strong in this answer. We only know from the stimulus that higher levels of carbon dioxide can make it easier for airborne illness to spread.
D
In 1980 the rate at which the cabin air was replenished in commercial airliners was sufficient to protect passengers from the effects of carbon dioxide buildup.
This answer is unsupported. We don’t know from the stimulus what the effects of carbon dioxide buildup are.
E
In 1980 the level of carbon dioxide in the cabin air on a two-hour commercial airline flight was lower than it is today on a similar flight.
This answer is strongly supported. Since cabin air would have been replaced every 30 minutes during a flight in 1980, that flight would have lower levels of carbon dioxide compared to a similar modern flight.

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LSAT PrepTest 117 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Logical Reasoning

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