3 friends A,B,C measures their weights in some order in 7 rounds as follows: A,B,C,AB,BC,AC,ABC.
Final round measure is 155kg.find the avrg weight of all the 7 rounds.

• given filanl round weight=155=a+b+c
  now
  a+b+c+(a+b)+(b+c)+(a+c)+(a+b+c)
  =4a+4b+4c=4(a+b+c)
  =4*155=620
  now the average weight=620/7=88.5714
• 13 years agoHelpfull: Yes(17) No(0)
• 88.57
• 13 years agoHelpfull: Yes(16) No(1)
• total weight measured in 7 round is
  A+B+C+(A+B)+(B+C)+(A+C)+(A+B+C)=3*(A+B+C).
  Given (A+B+C)=155
  then avg weight measured in 7 round is (3*155)/7=66.428
• 13 years agoHelpfull: Yes(9) No(13)
• insufficient data
• 13 years agoHelpfull: Yes(0) No(10)