Answer is 5/19
Explanation:
First of all, we need to add all the boys up, so all the black, brown, blonde, and red-haired boys up because that would help us compare a specific amount of hair-colored boys with the rest of the other hair-colored boys. There are 15 red-haired boys, 12 blonde-haired boys, 5 brown-haired boys, and 25-black haired boys. Adding them would equal 57.
Next, we take the group of red-haired boys (15 kids), and we compare them with the whole boys in the yearbook (including themselves as well). This gives us 15/57 kids, but we need to put it into the simplest form, so if we divide by 3 (Both of them are multiples of 3) we get 5/19.
I hope this helps.