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18 March, 19:07

Which one of the following statements expresses a true proportion? a. 54:9 = 6:3 b. 2:1 = 1:2 c. 3:4 = 9:12 d. 7:9 = 8:9

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  1. 18 March, 21:19
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    The answer is D, because 3:4 is the same as 9:12. If you multiply 3 and 4 by 3, you get 9 and 12 respectively. Therefore, 3:4 is the same as 9:12, a true proportion.
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