If a : b = 7 : 9 and b : c =15 : 7, then what is a : c?

1.	If a : b = 7 : 9 and b : c =15 : 7, then what is a : c?
A.	5 : 3
B.	3 : 5
C.	7 : 21
D.	7 : 15
Answer» B. 3 : 5

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If a : b = 7 : 9 and b : c =15 : 7, then what is a : c?

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