Final answer:
The fraction of daffodils in the bouquet is 2/5.
Step-by-step explanation:
The ratio of lilies to daffodils to marigolds in the bouquet is given as 7f:6:2f. To find the fraction of daffodils in the bouquet, we need to determine the total number of flowers in the bouquet and then calculate the fraction of daffodils. Let's assume the common factor 'f' is equal to 1, so the ratio becomes 7:6:2.
The total number of flowers in the bouquet is the sum of the numbers in the ratio, which is 7+6+2 = 15.