In a History examination, the average for the entire class was 80 marks. If 10% of the students scored 35 marks and 20% scored 90 marks, what was the average marks of the remaining students of the class ? Pick:
A) 22	B) 27	C) 75	D) 29	E) 271
Explanation:   Let the number of students in the class be 100 and let this required average be x.   Then, (10 * 95) + (20 * 90) + (70 * x) = (100 * 80)   =&gt; 70x = 8000 - (950 + 1800)= 
<gadget id="calculator">8000 - (950 + 1800)</gadget>
<output>5_250</output>
5250=&gt; x = 75.   Answer: 75) 75
<result>C</result>
In a History examination, the average for the entire class was 80 marks. If 10% of the students scored 35 marks and 20% scored 90 marks, what was the average marks of the remaining students of the class ?