13:7
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They are: 3 and 7
If you mean 21/18 then the equivalent ratio is 7/6
If the question relates to the ratio 21 : 8 compared with 3 : 1 then they are not equal. Dividing both parts of the first ratio by 8 gives 2⅝ : 1. However, 21 : 7 is equivalent to 3 : 1 as division of both parts of the first ratio by 7 gives 3 : 1.
It is because 39/18 = 13/6 and 52/24 = 13/6 in their lowest terms
an equivalent ratio is a ratio that you can both divide the top/bottom number evenly.