Question

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

Answer 1

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Let there be a total of 10 students in the class.

Total score = 800.

1 got 95.

2 got 90.

The remaining 7 students 800–95–180 = 525

So the average of the 7 remaining students = 525/7 = 75% marks.

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Answer 2

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Suppose students = 100

10 × 95 = 950

20 × 90 = 1800

950 + 1800 + 70x = 80 × 100

x = 75