The first thing you need to figure out is how many daisies are in the vase. There are 9. So the answer to question a is 7 roses to 9 daisies. The answer to question b is 9 daisies to 26 total flowers in the vase.
I wrote #:# or # to # or #/# because these are all of the ways you can write a ration. I wasn't sure which one you needed.