For example, the average weight of Party A and Party B is 32kg, that of Party A and Party C is 40kg, and that of Party B and Party C is 36kg. What are the weights of Party A, Party B and Party C respectively?
32+40+36 = 108kg, which is the sum of the weights of three people.
108-32×2=44 kg, and calculate the weight of C.
108-40× 2 = 28kg, and calculate the weight of B.
108-36× 2 = 36kg, calculate the weight of A. .....