In a class, 20% of the students were absent for an exam. 30% failed by 20 marks and 10% just passed. Find the average score of the class if the remaining students scored an average of 65 marks and the cut off for passing the exam is 40. Options.
A) 36 B) 302 C) 272 D) 292 E) 271
Explanation:   Let total students be 100.   Hence, marks of 20 students is 0 as they were absent.   30 students scored 20 marks (as they failed by 20 marks)   10 students scored 40 marks (just passed)   40 students scored 65 marks (average of 65)   Therefore, average score of the class is: (0 + 600 + 400 + 2600)/100 = 3600/100= 
<gadget id="calculator">3600/100</gadget>
<output>36</output>
36   36NSWER: 36
<result>A</result>
In a class, 20% of the students were absent for an exam. 30% failed by 20 marks and 10% just passed. Find the average score of the class if the remaining students scored an average of 65 marks and the cut off for passing the exam is 40.