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# A biscuit recipe calls for 3 2/3 cups of flour for 1 batch. How many cups are needed for 3 1/4 batches?

This problem can be solved easily using a proportion: $3\frac{2}{3} - 1$ $x - 3\frac{1}{4}$ So, $x= \frac{3\frac{2}{3} * 3\frac{1}{4}}{1}=3\frac{2}{3} * 3\frac{1}{4}=\frac{11}{3} * \frac{13}{4}=\frac{11*13}{3*4}=\frac{143}{12}=11\frac{11}{12}$ The answer:  $11\frac{11}{12}$ cups are needed.