Cara Marie M. answered 10/17/14
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Since the ratio of boys to girls is 3:1, we can express this ratio as 3x:1x.
The total number of students on sports teams is 300. So we know that:
3x + 1x = 300
4x = 300
x = 75
Now, we know that there are 3x boys on sports teams and 1x girls on sports teams.
Boys: 3(75) = 225
Girls: 1(75) = 75