C:65% Would be the answer i believe you're looking for, hope this helps!
You can multiply any number by both 9 and 27 to get an equivalent ratio. For example, you have 9:27. Multiply both of them by 2, and you get 18:54.
The answer of 1+1 is 2 put 1 finger up and the other one and just put them together and you get 2