Wyatt uses 3.15 cups of flour in a recipe that makes 9 shortcakes. cora uses 2.4 cups of flour in a recipe that makes 8 shortcakes. how much more flower per shortcake is needed for cora’s recipe?

We know that

1) Wyatt uses 3.15 cups of flour in a recipe that makes 9 shortcakes
so
3.15 cups> to make 9 shortcakes
x cups> 1 shortcakes
x=3.15/9> x=0.35 cup/shortcakes

2) Cora uses 2.4 cups of flour in a recipe that makes 8 shortcakes
so
2.4 cups> to make 8 shortcakes
x cups> 1 shortcakes
x=2.4/8> x=0.30 cup/shortcakes

difference=[0.35-0.30]=0.05 cup/shortcake

Cora uses 0.05 cup of flour less per shortcake than Wyatt

The answer that i got was 8/3

D.