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If an employee of Company A is selected at random for a

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If an employee of Company A is selected at random for a [#permalink] New post 29 Feb 2012, 09:11
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If an employee of Company A is selected at random for a survey, what is the probability that the employee is an executive?

(1) Company A employs 462 people.

(2) The ratio of the number of employees of Company A who are executives to the number of employees of Company A who are not executives is 2:9.
[Reveal] Spoiler: OA

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Re: If an employee of Company A is selected at random for a [#permalink] New post 29 Feb 2012, 09:21
Expert's post
If an employee of Company A is selected at random for a survey, what is the probability that the employee is an executive?

Question: executive/total=?

(1) Company A employs 462 people. Clearly insufficient.

(2) The ratio of the number of employees of Company A who are executives to the number of employees of Company A who are not executives is 2:9 --> executive/(not executive)=2/9 --> executive/total=2/11, since {total} = {executive}+{not executive}. Sufficient.

Answer: B.
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Re: If an employee of Company A is selected at random for a [#permalink] New post 01 Jul 2012, 22:52
It's B. Since a ratio of this kind gives us the probability. Bunuel works it out best.
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Re: If an employee of Company A is selected at random for a   [#permalink] 01 Jul 2012, 22:52
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