How can you express (15+30) as a multiple of us some of her numbers with no common factor?

Can someone me and plz do the problem

Alana has 12.5 cups of flour with which she is baking four loaves of raisin bread and one large pretzel. the pretzel requires 2.5 cups of flour to make. how much flour is in each loaf of raisin bread? explain the steps to follow to get the answer.

What’s the answer ? use the picture to see the problem