If a : b = 3 : 4, b : c = 7 : 9, c : d = 5 : 7, find a : d? – McqOptions

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1.	If a : b = 3 : 4, b : c = 7 : 9, c : d = 5 : 7, find a : d?
A.	11 : 5
B.	5 : 11
C.	5 : 12
D.	4 : 12
Answer» D. 4 : 12

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