In order to find that ratio, we need to count the number of green circles and the total number of circles. Then, we need to divide the number of green circles by the total number of circles.
Number of green circles: 5
Total number of circles: 15
Thus, the ratio of green circles to the total number of circles is:
[tex]\frac{5}{15}=\frac{1}{3}[/tex]Notice that we simplified the fraction 5/15 since both 5 and 15 are multiples of 5. So we divided both of them by 5 to find the simplified fraction 1/3.
Therefore, the answer, in its simplified form, is:
[tex]\frac{1}{3}[/tex]