Estimation and Computation
posted by Taylor .
The ratio of boys to girls in a class is 2:3. If a student is chosen at random to be on the student council, what is the probability it will be a girl?

Estimation and Computation 
Reiny
number of boys  2x
number of girls  3x
total number of students = 5x
prob (girl) = 3x/5x = 3/5
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