Question 556141
Call the number of any student x.  According to the ratio there are 3x girls and 2x boys.  Their number must equal 300:
3x + 2x = 300
5x=300
x=60
Boys is 2x = 120
Girls is 3x=180<P>
% = part/whole = boys/students = 120/300 = .4 = 40%
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