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One box contains 30 purple balls and 20 red balls, another

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Joined: 02 May 2004
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One box contains 30 purple balls and 20 red balls, another [#permalink]

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25 Aug 2007, 23:35
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

95. One box contains 30 purple balls and 20 red balls, another box contains 15 purple balls and 35 red balls, if Wendy randomly chooses one box and draws one ball from it, what will be the possibility that the ball will be purple?

A. 3/10
B. 3/20
C. 9/10
D. 9/20
E. 7/20
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Joined: 08 Jun 2005
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26 Aug 2007, 01:13
1/2*30/50+1/2*15/50 = 45/100 = 9/20

26 Aug 2007, 01:13
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