What is the mean score of 95,45,37,82,90,100,91,78,67,84,85,8 5,82,91,93,92,76,84,100,59,92,77,68 ,88

How to do this , and can some one explain

If 25% of y is 30, what is 60% of y?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?