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2016-01-12T19:21:43+08:00

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It's about partitive proportion..
2 + 7 = 9
180 ÷ 9 = 20
20 (2) = 40
20 (7) = 140
140 + 40 = 180


2 : 7 = 40 : 140

Therefore, the answer to your question is 140.
2 5 2
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