Student: 3 friends A, B, C went for week end party to McDonald’s restaurant and there they measure there weights in some order In 7 rounds. A, B, C, AB, BC, AC, ABC. Final round measure is 140kg then find the average weight of all the 7 rounds?\nOptions:\n(A) 98.5 kgs\n(B) 80 kgs\n(C) 76.5 kgs\n(D) 67.5 kgs\n(E) 58.2 kgs.
Another student: Let's say, hmmm...

User
Average weight = [(a + b + c + (a+b) + (b+c) + (c+a)+(a+b+c)] / 7 = 4 (a+b+c) /7 = 4 x 140/7 = 80 kgs Final answer: (B).
Assistant