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# Sixty-four percent of the members of a study group are aged 30 or old

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Senior CR Moderator
Status: Long way to go!
Joined: 10 Oct 2016
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Location: Viet Nam
Sixty-four percent of the members of a study group are aged 30 or old  [#permalink]

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14 Apr 2017, 21:34
1
00:00

Difficulty:

25% (medium)

Question Stats:

81% (01:39) correct 19% (02:15) wrong based on 46 sessions

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Sixty-four percent of the members of a study group are aged 30 or older, and 12.5 percent of those individuals aged 30 or older are teachers. If one member of the study group is to be selected at random, what is the probability that the member selected is a teacher aged 30 or older?

A. 0.080
B. 0.100
C. 0.125
D. 0.150
E. 0.165

Source: GMAT Free

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Re: Sixty-four percent of the members of a study group are aged 30 or old  [#permalink]

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14 Apr 2017, 22:48
0.64*0.125 = 0.08
Math Expert
Joined: 02 Sep 2009
Posts: 50002
Re: Sixty-four percent of the members of a study group are aged 30 or old  [#permalink]

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15 Apr 2017, 02:56
nguyendinhtuong wrote:
Sixty-four percent of the members of a study group are aged 30 or older, and 12.5 percent of those individuals aged 30 or older are teachers. If one member of the study group is to be selected at random, what is the probability that the member selected is a teacher aged 30 or older?

A. 0.080
B. 0.100
C. 0.125
D. 0.150
E. 0.165

Source: GMAT Free

It seems that GMAT Free just rewords OG and GMAT Prep questions: https://gmatclub.com/forum/sixty-percen ... 43900.html
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Re: Sixty-four percent of the members of a study group are aged 30 or old &nbs [#permalink] 15 Apr 2017, 02:56
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