Answer:
5F = 17B.
Explanation:
While making banana bread, Priya uses 17.5 cups of flour to make 5 loaves of banana bread.
That means
17.5 cups of flour is required for 5 loaves of banana breads.
So, F cups of four will be required to make number of banana breads =

As mentioned in the second part of question, the number of banana breads is equal to B loaves.
So,

So the relation between cups of flour and number of loaves of banana breads is 5F = 17B.