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

1.	If a : b = 5 : 7 and c : d = 2a : 3b, then ac : bd is :
A.	20 : 38
B.	50 : 147
C.	10 : 21
D.	50 : 151
Answer» C. 10 : 21

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

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