Well, you can't determine that with this information.
We would need to know the number of girls, or boys.
Like this:
There are 8 students of the mini bus. There are 3 girls. What fraction of the students are boys?
So, there are 8 persons. So the denominator is 8.
?/8
And there is 3 girls. So you would subtract 3 from 8.
Which is 5.
So there is 5 boys!
And the fraction is 5/8 and can not be simplified.
