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In the final year class of mechanical engineering at IIT-H, there are 90 students. The students have a compulsory course of fluid dynamics in the final semester. Other than this, the students can opt for at most two humanities optionals among History, Economics, Sociology and Psychology. Each student has to take at least 1 optional. 9 students from the class opted for both History and Economics. 20 students opted for both Economics and Sociology. None of the students in the class opted for both History and Sociology. In the test on fluid dynamics, the average score of those who opted for history is 45 and of those opted for Sociology was 65. However, the combined average marks in fluid dynamics of the students who opted for these subjects is 50. What is the maximum possible number of students who opted for only Economics?
A. 10
B. 15
C. 5
D. 20
E. 25
A. 10
B. 15
C. 5
D. 20
E. 25
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