1/6
This is because the probability of pulling a red is 1/3. Multiply that by itself to find the chance of repeating.
8.9 because I used a calculator
5/8 is more than 11/20
If we find the lower common multiple of the denominators which is 160 then we can multiply the top numerators by the opposite denominators
5x20=100
11x8=88
We now have

The one on the left is simplified to 5/8 and the right is simplified to 11/20