30 students had an average of X, while 20 students had an average of

30 students had an average of X, while 20 students had an average of 80. What is the average for the entire group?

(A) (X + 80)/50
(B) (X + 80)/2
(C) 50/(X + 80)
(D) 3X/5 + 32
(E) (30X + 80)/50