Question

if A:B=3 :5 and B :C =4 :7 find A :B :C

Answer 1

Hope u like my process.
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A:B = 3:5

B:C= 4:7

Let B be (4×5)x =20x.

So, A:B= 3×4x :20x = 12x:20x.

B:C= 20x :7×5x = 20x:35x..

So, A:B:C= 12x:20x:35x=12:20:35
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Answer 2

A : B = 3 : 5 = 12 : 20
B : C = 4 : 7 = 20 : 35
Therefore A : B : C = 12 : 20 : 35