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?\nOptions:\n(A) 40\n(B) 60\n(C) 20\n(D) Data inadequate\n(E) None of the above Hmmm, my stream of consciousness:
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E + H = (55 × 2) = 110;\nE + S = (65 × 2) = 130\n∴ Reqd difference = 130 – 110 = 20 So, the answer is (C).
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