I dont know if there is any more but
it would be 12/12
or 3/5
i dont know what you want me to explain the meaning of but i think that means that there are 12 kids to 20 adults hope it helps
A triangle has 3 sides....each side measuring 0.75 inches...and the perimeter is the total of all 3 sides.
0.75(3) = 2.25 inches