The fraction 20/21 is equal to 95.24% when converted to a percentage. This means that if you had 21 equal parts of something and took 20 of those parts, you'd have about 95% of the whole. It's a pretty high percentage, showing that 20/21 is very close to being a complete whole or 100%.
To put this in perspective, if you scored 20 out of 21 on a test, you'd get a grade of 95.24%. That's an excellent score! In many situations, 20/21 or 95.24% would be considered nearly perfect. It's just a tiny bit shy of being complete, missing only about 1/21 or 4.76% of the total.