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In a hostel, 60% of the students read Spanish news paper,

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Intern
Joined: 11 Oct 2008
Posts: 10

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In a hostel, 60% of the students read Spanish news paper, [#permalink]

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21 Oct 2008, 12:54
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

In a hostel, 60% of the students read Spanish news paper, 40% read English news
paper and 20% read both Spanish and English news papers. A student is selected
at random. If she reads Spanish news paper, find the probability that she reads English
news paper.

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Senior Manager
Joined: 04 Aug 2008
Posts: 372

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21 Oct 2008, 13:01
is it 1/4

plz post the choices when u post questions
_________________

The one who flies is worthy. The one who is worthy flies. The one who doesn't fly isn't worthy

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Intern
Joined: 11 Oct 2008
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21 Oct 2008, 13:04

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SVP
Joined: 07 Nov 2007
Posts: 1792

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Location: New York

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21 Oct 2008, 13:05
1
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earthwork wrote:
In a hostel, 60% of the students read Spanish news paper, 40% read English news
paper and 20% read both Spanish and English news papers. A student is selected
at random. If she reads Spanish news paper, find the probability that she reads English
news paper.

say total 100 students.

p = 20/60 = 1/3
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Smiling wins more friends than frowning

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VP
Joined: 05 Jul 2008
Posts: 1402

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22 Oct 2008, 10:32
Yep! Fill the grid.

Find out S n E / S

20/60 = 1/3

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Re: probability   [#permalink] 22 Oct 2008, 10:32
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