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

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Senior Manager
Senior Manager
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Joined: 02 May 2004
Posts: 313
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Kudos [?]: 6 [0], given: 0

One box contains 30 purple balls and 20 red balls, another [#permalink] New post 25 Aug 2007, 23:35
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
Posts: 1146
Followers: 6

Kudos [?]: 136 [0], given: 0

 [#permalink] New post 26 Aug 2007, 01:13
1/2*30/50+1/2*15/50 = 45/100 = 9/20

The answer is (D)

:-D
  [#permalink] 26 Aug 2007, 01:13
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One box contains 30 purple balls and 20 red balls, another

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