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?
Choose the correct choice from the following choices:
A) 40
B) 60
C) 20
D) Data inadequate
E) None of the above
E + H = (55 × 2) = 110;   E + S = (65 × 2) = 130   ∴ Reqd difference = 130 – 110 = 20   Answer 20
<result>C</result>
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?