30 is not a ratio. In a ratio, two numbers are always specified, for example, 30:1. If that's what you mean, you can simply multiply both numbers - in this case, 30 and 1 - by any real number (both by the same real number), to get an equivalent ratio.
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The ratio of 30 to 10 is the same as a ratio of 3 to 1.
Yes
27.25 percent is the same as 0.2725, which is also the same as 2725/10000. Reduced to lowest terms, that is 109/400.
A percent is a ratio of a number to 100.
Oh, dude, converting 25 percent to a ratio is like converting your couch into a spaceship. So, 25 percent is the same as 25 out of 100, which simplifies to 1 out of 4. That's your ratio, my friend. Now you can impress all your math-loving pals with your newfound knowledge.