Answer:
1:1
Step-by-step explanation:
There are 15 odds and 15 evens. This is a 15:15 ratio. Any ratio that is a number to itself is equal to 1:1. So 15:15 in simplest form is 1:1.
1- odd
2- even
3- odd
4- even
5- odd
6- even
7- odd
8- even
9- odd
10- even
11- odd
12- even
13- odd
14- even
15- odd
16- even
17- odd
18- even
19- odd
20- even
21- odd
22- even
23- odd
24- even
25- odd
26- even
27- odd
28- even
29- odd
30- even