A, B and C secured 45%, 50% and 60% marks respectively in Biology. D's marks in Biology are 10 more than A's marks and 20 less than C's marks. Find out the total marks of the four students. (M.A.T., 2006) I. Maximum marks for Biology are 200. II. Total of D's and A's marks is 190. III. C has obtained 120 marks.