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If a student is selected at random from Learngood

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Director
Joined: 01 Apr 2008
Posts: 905
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 18

Kudos [?]: 331 [0], given: 18

If a student is selected at random from Learngood [#permalink]  25 Oct 2009, 04:18
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Difficulty:

(N/A)

Question Stats:

80% (01:10) correct 20% (00:05) wrong based on 10 sessions
If a student is selected at random from Learngood Elementary, what is the probability that the student will be a boy?

(1) There are 480 students at Learngood.

(2) At Learngood, the ratio of boys to girls is 7 : 5
Senior Manager
Joined: 18 Aug 2009
Posts: 329
Followers: 8

Kudos [?]: 209 [0], given: 13

Re: prob4 [#permalink]  25 Oct 2009, 09:54
IMO B

State 1: We do not know how many students are boys out of 480. Insufficient
State 2: 7/12. Sufficient
Re: prob4   [#permalink] 25 Oct 2009, 09:54
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