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?
(A) 0.05 cup
(C) 0.25 cup
(B) 0.20 cup
(D) \( 0.50 \mathrm{cup} \)
Answer
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Answer
\( f_W - f_C = \Delta f \)
Steps
Step 1 ：\( \frac{3.15\,\mathrm{cups}}{9\,\mathrm{shortcakes}} = f_W \)
Step 2 ：\( \frac{2.4\,\mathrm{cups}}{8\,\mathrm{shortcakes}} = f_C \)
Step 3 ：\( f_W - f_C = \Delta f \)
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