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
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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
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