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# Morgan Stanley is hosting an investment conference in sunny

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GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4288
Morgan Stanley is hosting an investment conference in sunny [#permalink]

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09 Nov 2004, 21:54
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Morgan Stanley is hosting an investment conference in sunny Phoenix and the investors attending the conference are offered to either play tennis or golf. 90% of the attendees who know how to play tennis also know how to play golf, whereas, 18% of the attendees do not know how to play either sport and will stay in their hotel rooms and do their homework to prepare for their breakout meetings. If 30% of the conference attendees do not how to play tennis, then how many attendees know how to play golf?

1)38.0%
2)46.5%
3)66.0%
4)75.0%
5)84.5%
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Best Regards,

Paul

Intern
Joined: 08 Nov 2004
Posts: 46
Location: Montreal

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10 Nov 2004, 08:25
Me too 75%

- 30% don't know tennis, and 18% know neither

So, 30 - 18 = 12% know golf alone

- 70% know tennis, and 90% of them know both

So, 70 * 0.9 = 63% know both

>>>> 63 + 12 = 75% know golf
10 Nov 2004, 08:25
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