Question

30 students had an average of x, while 20 students had an average of 80. The average for the entire group is?

Answer 1

group is of 50 or 30 students?

Answer 2

yeah, valid question!! pls clarify....

Answer 3

if the total number of students is 50:
80x20 is the sum of the 20 students' scores.
30x is the sum of the 30 students' scores.
so (30x+1600)/50 ... 50 is the total number of students
(3x+160)/50 is the average.