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x+y=24.......(2)
de(1)
x=4y/8=y/2
x=y/2.......(3)
(3) en(2)
x+y=24
y/2+y=24
3y/2=24
y=2×24/3
y=16
x=y/2=16/2=8
x=8
x edad de alejandro = 8
y edad de ariane =16