Question

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? solution

Answer 1

The final round measures the weight of abc :

abc = 155kg

This implies that this is the weight of the three ie. abc.

The sum of the first, second and third round is :

a + b + c = 155kg

The sum of the fourth, the fifth and the sixth round is :

ab + bc + ac = (a + b + c) + (a + b + c)

= 155 + 155 = 310 kg

The total weight is :

155 + 155 + 310 = 620

Average weight of the seven rounds is :

620/7 = 88.57 Kg