What is the 6th term of the geometric sequence shown? 80, 40, 20, . .a: 1b: 1 1 over 4c: 2 1 over 2d: 5

Than you check this line of terms 

1. 80=160/2
2. 40=80/2
3. 20=40/2
4. 10=20/2
5.   5=10/2
6. 2 1/2 = 5/2  so what mean that choice c. is right sure 

hope this will help you 

Figure it out your self

The answer is a 5/20 because if u add all of the marbles there are 20 and there are 5 red marbles so 5/20 is the answer mark as brainliest