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17-10-2016
Mathematics

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Write the following proportion using colons. 7 is to 21 as 3 is to 9.

A. 7:21 = 9:3
B. 7:3 = 21:9
C. 21:7 = 3:9
D. 7:21 = 3:9

Respuesta :

17-10-2016

the answer is D. 7:21=3:9

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