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2016-03-10T20:11:37+08:00

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9:18 is another version of 1:2; 1:2=9:8

Anyway, ratio is like for x number of this, there is y number of that. So if there is 1 object for 2 of another abject, that will be equal to having 9 of one object for 18 of another.
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2016-03-12T00:16:51+08:00

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Find the greatest common factor (GCF) of 9 and 18, then divide each by their GCF.

GCF of 9 and 18 is 9.

(9÷9) : (18 ÷ 9)  ⇒   1 : 2

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