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maria=y
ana=z------13
x+y=125
x+z=81
y+z=70
x+y=125
x=125-y
y+z=70
z=70-y
x+z=81
(125-y)+(70-y)=81
195 -81 = 2y
114=2y
114/2=y
57=y
y+z=70
57 +z=70
z=13