If a: b = c : d = e : f = 1 : 2 then (3a + 5c + 7e) : (3b + 5d + 7f) =

1.	If a: b = c : d = e : f = 1 : 2 then (3a + 5c + 7e) : (3b + 5d + 7f) = ?
A.	1 : 2
B.	2 : 3
C.	3 : 4
D.	4 : 5
Answer» B. 2 : 3

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If a: b = c : d = e : f = 1 : 2 then (3a + 5c + 7e) : (3b + 5d + 7f) = ?

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