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OpenStudy (anonymous):
There are 40 people at a reception for international students. The students, boys and girls, are from Peru and China. 18 of all the students are boys, and 12 of all the students are Peruvian. 7 of the Peruvians are girls. Given that a student is a boy, what is the probability that he is Peruvian?
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OpenStudy (anonymous):
12/18 =2/3
OpenStudy (anonymous):
wait
OpenStudy (anonymous):
thats not right
OpenStudy (anonymous):
should be 5/18
OpenStudy (anonymous):
thanks!
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