# Time passing

6 years ago, Marcela's mother was two times older than her and two times younger than her father. When Marcela is 36, she will be twice as young as her father. How old are Marcela, her father, and mother now?

Correct result:

m =  18
o =  54
w =  30

#### Solution:

2(m-6) = w-6
w-6 = (o-6)/2
36 = (o+(36-m))/2

2•(m-6) = w-6
w-6 = (o-6)/2
36 = (o+(36-m))/2

2m-w = 6
o-2w = -6
m-o = -36

m = 18
o = 54
w = 30

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