I couldn't get the question for a bit. But then I viewed it as a 'word problem'

A certain bread recipe calls for whole wheat flour, white flour, and oat flour in the ratio of 3 : 2 : 1, respectively. How many cups of oat flour are needed to make a loaf of bread?

(1) A total of 30 cups of whole wheat and white flour are needed to make 3 loaves of bread.

3 loaves = 15 x [(3x + 2x +x) taken 5 times] In addition, 30 = 3x +2x(taken 3 times) We can accordingly figure the oatmeal amount(2) Two more cups of whole wheat flour than white flour are needed for every loaf

This changes the given proportion by 2 -->3(2) - 4 -(2)1. So we get oatmeal againExperts, please request your input if my approach was wrong.

Kudos if it was useful for you