If a : b = 7 : 5 and c : d = 2a : 3b, then ac : bd is :

1.	If a : b = 7 : 5 and c : d = 2a : 3b, then ac : bd is :
A.	14:15
B.	50:147
C.	98:75
D.	15:14
Answer» D. 15:14

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If a : b = 7 : 5 and c : d = 2a : 3b, then ac : bd is :

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