The bouquets are put toghether with 3 daisies, 5 carnations and 2 roses, this is a total of 10 flowers.
The flower ration for the whole bouquet is 3:5:2
Now you are not interested in the carnations, so payin attention only to the daisies and roses you will have 3 daisies for ever 2 roses for each bouquet, expressed as ratio:
3:2