The average of Suresh's marks in English and History is 55. His average of marks in English and Science is 65. What is the difference between the marks which he obtained in History and Science?
Options:
(A) 40
(B) 60
(C) 20
(D) Data inadequate
(E) None of the above Stream of consciousness:
E + H = (55 2) = 110;
E + S = (65 2) = 130
Reqd difference = 130 110 = 20
Thus, the answer is (C).