Question

Average marks of the students of Class A is of 68. If Class B consisting of students having an average 72 joins them, then the average marks of A & B becomes 69.33. If Class C consisting of a few students having an average mark of 65 joins Class A, then average marks of A & C becomes 66.2. What will be the combined average mark of class B and class C?___

Answer 1

The correct answer is 66.75 . Check the video for the approach.