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All geologists must pass a written test and a field test to become lic

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Senior Manager
Senior Manager
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Joined: 02 Jan 2017
Posts: 315
Location: Canada
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All geologists must pass a written test and a field test to become lic [#permalink]

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New post 14 Mar 2017, 02:16
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Question Stats:

64% (01:23) correct 36% (00:57) wrong based on 42 sessions

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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.
[Reveal] Spoiler: OA
Senior Manager
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Joined: 05 Jan 2017
Posts: 434
Location: India
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Re: All geologists must pass a written test and a field test to become lic [#permalink]

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New post 15 Mar 2017, 04:26
total = 100= N(do not pass both exam ) +N(pass written) +N(pass field)- N(pass both)
St 1:N(do not pass both exam ) = 10
therefore N(pass written) +N(pass field)- N(pass both) = 90.
or 70 +90 -N(pass both) = 90
or N(pass both) = 70. ANSWER

St 2: N(pass field only) = N(pass field)- N(pass both) = 20.
or 90 -N(pass both) =20
or N(pass both) = 70. ANSWER

Option D
Re: All geologists must pass a written test and a field test to become lic   [#permalink] 15 Mar 2017, 04:26
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All geologists must pass a written test and a field test to become lic

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