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 ?
Correct Answer: Option C
Let the number of students in the class be 100 and let this required average be x.
Then, (10 \(\times\) 95) + (20 \(\times\) 90) + (70 \(\times\) x) = (100 \(\times\) 80)
=> 70x = 8000 - (950 + 1800) = 5250
=> x = 75.
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