All the students in a class can sing or dance. The number of students who can both sing and dance is one fifth of those who can sing and one fourth of those who can dance. How many times as many students can only sing as those can only dance?
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A$$\frac{2}{9}$$
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B$$\frac{1}{3}$$
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C$$\frac{5}{9}$$
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D$$\frac{7}{9}$$
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E$$\frac{4}{3}$$
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正确答案: E