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a : b = 3 : 4 = 3(3 : 4) = 9 : 12
a : b = 9 : 12
b : c = 12 : 20
Entonces:
a : b : c = 9 : 12 : 20
Saludos!
a=3k ; b=4k ; b=12j ; c=20j
igualas los valores de "b"
4k = 12j (sacas tercia) → k = 3j
k =3 ; j=1
⇒ a=3(3)=9 ; b=4(3)=12 ; c=20(1)=20
⇒a:b:c=9:12:20