The average mark in Maths of 10 friends is 85. The average of the top 9 highest marks getter is 90. The average mark of the bottom 9 marks getter is 80. What is the average of the highest and the lowest marks?
1
78
2
90
3
85
4
45
5
65
The average mark in Maths of 10 friends is 85. The average of the top 9 highest marks getter is 90. The average mark of the bottom 9 marks getter is 80. What is the average of the highest and the lowest marks?