Father and son

Father and son weigh together 108kg.
The father weighs 2.6 times more than his son.

How much does weight my father and son count?

Correct result:

a =  78
b =  30

Solution:


a+b=108
a = 2.6 b

a+b=108
a = 2.6•b

a+b = 108
a-2.6b = 0

a = 78
b = 30

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