This problem can be solved easily using a proportion:
[tex] 3\frac{2}{3} - 1[/tex]
[tex]x - 3\frac{1}{4} [/tex]
So, [tex]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}[/tex]
The answer: [tex]11\frac{11}{12}[/tex] cups are needed.
