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15 Oct 2019, 02:40
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
68% (01:39) correct
32%
(01:43)
wrong
based on 231
sessions
History
Date
Time
Result
Not Attempted Yet
All geologists must pass a written test and a field test to become licensed. If 70% of geologists pass the written test and 90% of geologists pass the fieldtest, what percent pass both tests?
(1) 10% did not pass either test.
(2) 20% passed only the field test.
(1) 10% did not pass either test.
(2) 20% passed only the field test.
15 Oct 2019, 03:39
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Bunuel
All geologists must pass a written test and a field test to become licensed. If 70% of geologists pass the written test and 90% of geologists pass the fieldtest, what percent pass both tests?
(1) 10% did not pass either test.
(2) 20% passed only the field test.
(1) 10% did not pass either test.
(2) 20% passed only the field test.
Assume that there are 100 geologists applying for a license. As per the question stem,
70 pass the written test and 90 pass the field test. We don't know how many people
pass both the tests.
1. 10% did not pass either test -> Neither = 10
Total = P(W) + P(F) - Both + Neither -> 100 = 70 + 90 - Both + 10 -> Both = 70 (Sufficient)
2. 20% passed only the field test -> P(Only F) = 20
We know that P(F) = P(Only F) + Both -> Both = P(F) - P(Only F) = 90 - 20 = 70 (Sufficient - Option D)
15 Oct 2019, 03:57
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Bunuel
All geologists must pass a written test and a field test to become licensed. If 70% of geologists pass the written test and 90% of geologists pass the fieldtest, what percent pass both tests?
Let the pass percent of both = X
(1) 10% did not pass either test.
--> Sufficient
(2) 20% passed only the field test.
Let the pass percent of both = X
(1) 10% did not pass either test.
--> Sufficient
(2) 20% passed only the field test.
--> Sufficient
IMO Option D
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