the average marks of a group of 10 students in a class and A+8 is the average of a
group of 15 students whch included the group of 10 students as given. The total marks
obtained by the group of 10 students is X and the total marks obtained by the group of 15
students is Y. If X : Y = 3 : 5, then the value of A+X+Y is ______