In a English examination the average for the entire class was 80 marks If 10 of the students scored ...........

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In a English examination, the average for the entire class was 80 marks. If 10% of the students scored 95 marks and 20% scored 90 marks. What was the average marks of the remaining students of the class?

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Explanation:

Suppose there are 100 students then total marks = 100 × 80 = 8000.
Now, 10% of total students = 10
Total marks of these 10% students = 95 × 10 = 950
20% of total students = 20
Total marks of these 20% students = 20 × 90 = 1800
Now, remaining marks = 8000 – (950 + 1800) = 5250
And no. of stundest left = 100 – (10 + 20) = 70
Therefore, average marks of the remaining students = 5250 /70 = 75