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 answer:

a =  78
b =  30

Step-by-step explanation:


a+b=108
a = 2.6 b

a+b=108
a = 2.6·b

a+b = 108
a-2.6b = 0

Row 2 - Row 1 → Row 2
a+b = 108
-3.6b = -108


b = -108/-3.6 = 30
a = 108-b = 108-30 = 78

a = 78
b = 30

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