At Essex High School 100 students are taking chemistry and 80 students are taking are biology. If 20 students are taking both chemistry and biology, what is the ratio of the number of students taking only chemistry to the number taking only biology?
(A)\(\frac { 3 } { 4 } \) (B)\(\frac { 4 } { 5 } \) (C)\(\frac { 1 } { 1 } \) (D)\(\frac { 5 } { 4 } \) (E)\(\frac { 4 } { 3 } \)
E