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

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Senior Manager
Joined: 02 Jan 2017
Posts: 312
All geologists must pass a written test and a field test to become lic  [#permalink]

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14 Mar 2017, 03:16
1
00:00

Difficulty:

45% (medium)

Question Stats:

67% (01:21) correct 33% (00:57) wrong based on 45 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.
Senior Manager
Status: Come! Fall in Love with Learning!
Joined: 05 Jan 2017
Posts: 468
Location: India
Re: All geologists must pass a written test and a field test to become lic  [#permalink]

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15 Mar 2017, 05:26
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
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Re: All geologists must pass a written test and a field test to become lic &nbs [#permalink] 15 Mar 2017, 05:26
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# All geologists must pass a written test and a field test to become lic

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