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MuskaanMittal
11 Sep 2025, 00:12
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
55% (02:42) correct
45%
(02:43)
wrong
based on 201
sessions
History
Date
Time
Result
Not Attempted Yet
The electrical systems of all houses built prior to 1960 contain copper wiring, which is superior to aluminum wiring. The plumbing systems of some houses built in this time period, however, contain lead pipes, which can contaminate a house's water supply. But there is good news. At least some houses containing copper wiring are not built on landfills, and no houses built on landfills have plumbing containing lead pipes.
If the statements above are true, then which of the following must also, on the basis of those statements, be true?
(A) Some houses built on landfills do not contain copper wiring in their electrical systems
(B) Some houses built on landfills do contain copper wiring in their electrical systems
(C) Some houses with lead pipes in their plumbing systems also contain copper wiring in their electrical systems
(D) Some houses built prior to 1960 do not contain copper wiring in their electrical systems
(E) Some houses with lead pipes in their plumbing systems are not houses other than those built on landfills
If the statements above are true, then which of the following must also, on the basis of those statements, be true?
(A) Some houses built on landfills do not contain copper wiring in their electrical systems
(B) Some houses built on landfills do contain copper wiring in their electrical systems
(C) Some houses with lead pipes in their plumbing systems also contain copper wiring in their electrical systems
(D) Some houses built prior to 1960 do not contain copper wiring in their electrical systems
(E) Some houses with lead pipes in their plumbing systems are not houses other than those built on landfills
MuskaanMittal
11 Sep 2025, 00:13
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Question Explanation
The question stem asks which of the following must also...be true, so this is an inference question. Do not bother breaking the passage into its conclusion, premise, and assumption for inference questions. Instead, focus on what the passage states directly. The correct answer must be true based on the facts in the passage. The passage presents wiring and pipe information for houses built prior to 1960. The passage states that all houses built prior to 1960 contain copper wiring, and that some houses built in this time period...contain lead pipes. The passage then states that at least some houses containing copper wiring are not built on landfills, and that no houses built on landfills...have lead pipes. Evaluate the answer choices.
Choice A: No. This choice is out of scope. While the passage does state some houses containing copper wiring are not built on landfills, there is no information about whether other types of houses are built on landfills.
Choice B: No. This choice is out of scope. The passage states that at least some houses containing copper wiring are not built on landfills, but it provides no information about whether some houses with copper wiring are built on landfills.
Choice C: Correct. The passage states that all houses built prior to 1960 contain copper wiring, and some houses built in this time period...contain lead pipes. Therefore, it must be true that Some houses with lead pipes...also contain copper wiring.
Choice D: No. Some houses built prior to 1960 do not contain copper wiring is a reversal. The passage states that all houses built prior to 1960 contain copper wiring.
Choice E: No. Some houses with lead pipes...are not houses other than those built on landfills is a reversal. The passage states that no houses built on landfills have...lead pipes.
The correct answer is choice C.
The question stem asks which of the following must also...be true, so this is an inference question. Do not bother breaking the passage into its conclusion, premise, and assumption for inference questions. Instead, focus on what the passage states directly. The correct answer must be true based on the facts in the passage. The passage presents wiring and pipe information for houses built prior to 1960. The passage states that all houses built prior to 1960 contain copper wiring, and that some houses built in this time period...contain lead pipes. The passage then states that at least some houses containing copper wiring are not built on landfills, and that no houses built on landfills...have lead pipes. Evaluate the answer choices.
Choice A: No. This choice is out of scope. While the passage does state some houses containing copper wiring are not built on landfills, there is no information about whether other types of houses are built on landfills.
Choice B: No. This choice is out of scope. The passage states that at least some houses containing copper wiring are not built on landfills, but it provides no information about whether some houses with copper wiring are built on landfills.
Choice C: Correct. The passage states that all houses built prior to 1960 contain copper wiring, and some houses built in this time period...contain lead pipes. Therefore, it must be true that Some houses with lead pipes...also contain copper wiring.
Choice D: No. Some houses built prior to 1960 do not contain copper wiring is a reversal. The passage states that all houses built prior to 1960 contain copper wiring.
Choice E: No. Some houses with lead pipes...are not houses other than those built on landfills is a reversal. The passage states that no houses built on landfills have...lead pipes.
The correct answer is choice C.
