The 12 students in a cooking class are baking cakes. If 9 student

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The 12 students in a cooking class are baking cakes. If 9 students bake cakes requiring $$2\frac{1}{2}$$ cups of flour each and the rest bake cakes requiring$$2\frac{3}{4}$$ cups of flour each, how many cups of flour will be needed in all?

A、$$25\frac{1}{4}$$
B、$$30\frac{3}{4}$$
C、$$31\frac{3}{4}$$
D、$$45\frac{1}{4}$$
E、$$60\frac{1}{4}$$

答案：B

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