I'm unable to understand this question Ques - In a class, 20% of the students were absent for an exam. 10% failed by 10 marks and 20% just passed because of grace marks of 5. Find the average score of the class if the remaining students scored an average of 50 marks and the pass marks are 30 .Here while taking the average score of the class, the base should be 100 or 80and will the equation be = 20*0 + 10*20 +20*30 + 50*50 / 100 OR 10*20 +20*30 + 50*50 / 80. as both gives me a different answer.

I'm unable to understand this question IMG_20250619_194030516.jpg 87.88 KB

I'm unable to understand this question IMG_20250619_194030516.jpg 87.88 KB