题目信息
Of all the students in a certain dormitory, $$\frac{1}{2}$$ are first year students and the rest are second-year students. !f $$\frac{4}{5}$$ of the first-year students have not declared a major and if the fraction of second-year students who have declared a major is 3 times the fraction of first-year students who have declared a major, what fraction of all the students in the dormitory are· second-year students who have not declared a major?
A:$$\frac{1}{15}$$
B:$$\frac{1}{5}$$
C:$$\frac{4}{15}$$
D:$$\frac{1}{3}$$
E:$$\frac{2}{5}$$
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正确答案：
B:$$\frac{1}{5}$$
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