Question

x-ojciec
y-syn
(x-y) - różnica wieku

y=3(y-(x-y))
x=77-(x-y)

Answer 1

y=3(y-x+y)

x+77-x+y

 

y=3y-3x+3y

2x=77+y/:2

 

y=6y-3x

x=38,5+1/2y

 

y=6y -3(38,5+1/2y)

x=38,5+1/2y

 

y=6y-115,5-3/2y

x=38,5+1/2y

 

-3,5y=-115,5/:(-3,5)

x=38,5+1/2y

 

y=33

x=38,5+16,5

 

y=33

x=55