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a/b =3/1
a=3k
b=k
a+b = 3k +k =120
4k=120
k=30
a=3(30)
a=90
X/(120 - X) = 3 X = 360 - 3X 4X = 360 X = 360/4 = 90 el mayor
y 120 - 90 = 30 el menor