In a History 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 mars of the remaining students of the class ?
Let the number of students in the class be 100 and let the required average be `x`
Then,` (10 xx 95) + (20 xx 90) + (70 xx x)` = 100 x 80
`hArr 70x = 8000 - (950 + 1800) = 5250 hArr x` = 75.
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