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# If a student is selected at random from Learngood

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Director
Joined: 01 Apr 2008
Posts: 881
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
If a student is selected at random from Learngood [#permalink]

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25 Oct 2009, 05:18
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Question Stats:

80% (01:10) correct 20% (00:05) wrong based on 10 sessions

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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: 320

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25 Oct 2009, 10:54
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, 10:54
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