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60% of the students in a certain class like playing computer

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Current Student
Joined: 11 May 2008
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60% of the students in a certain class like playing computer [#permalink]  04 Sep 2008, 22:55
60% of the students in a certain class like playing computer games. What percent of the students in the class have a computer?
(1) 90% of the students who like games have a computer.
(2) 10% of the student neither have a computer nor like computer games.
SVP
Joined: 17 Jun 2008
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Re: COMPUTER GMAES [#permalink]  04 Sep 2008, 23:06
Not good at set questions....trying to answer.

If g represents the % of students playing games and c % of students having computer then
gUC = 100
gAC = 54 (90% of 60)
g = 60
gUc' = 10

thus, 100 = 60 + c - 54 + 10

or c = 84%

Senior Manager
Joined: 16 Jul 2008
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Re: COMPUTER GMAES [#permalink]  04 Sep 2008, 23:06
C.

60 students like computer games. 1) 54 students out of those 60 have a computer, but nothing is known about the remaining 40. 2) of the remaining 40, 30 students have a computer. In total, 84 students, or 84% have a computer.
_________________
Re: COMPUTER GMAES   [#permalink] 04 Sep 2008, 23:06
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