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10 December, 11:20

Which pair of ratios form a proportion? A. 2 : 3 and 3 : 4 B. 8 : 12 and 16 : 20 C. 4 : 7 and 12 : 21 D. 9 : 15 and 10 : 16

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  1. 10 December, 11:33
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    C.

    You can simplify 12:21 to 4:7 by dividing 12 by 3 to get 4 and by dividing 21 by 3 to get 7. Because dividing both those numbers in the one ratio by 3 gives you the other ratio, they are a proportion.
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