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 155 kg, then find the average weight of all the 7 rounds?
Choose the correct choice from the following answers:
A) 56
B) 66
C) 77
D) 88
E) 99
Its finally a easy one..haha   (A+B+C+AB+BC+CA+ABC)/7 ...as given ABC=155   so A+B+C also equal to 155 and AB+BC+CA=2ABC=(2*155)   finally..(155+2*155+155)/7=88.57   ANSWER:88
<result>D</result>
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 155 kg, then find the average weight of all the 7 rounds?