She is baking loaves of bread . For each loaf of bread she uses 1/6 of a teaspoon of baking powder and 4 cups of flour.
What she possess to make bread is 4/7 teaspoon of powder and 15 cups of flour. Therefore the fraction of flour she can use with 4/7 teaspoon of baking powder can be computed below.
She uses 96/7 fraction of flour.