You express ratio as a fraction. For instance, the ratio of 3 to 4 is 3/4, or .75
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12.0 : 30.0 = 40.0%
257:144
As 21 is 3 x 7 the ratio 7:21 = 1:3
5/6 or 5 to 6 as a ratio.
Express the numbers in lowest form and then if it's an improper number, change it into a mixed number. :))