20/48 as a percentage is 41.67%. This is the rounded value you get when you turn the fraction into a percent.
The fraction 20/48 can be simplified to 5/12, which still represents the same part of a whole. Whether you write it as 20/48, 5/12, or 41.67%, the meaning stays the same: a little less than half.
You might see this kind of number when looking at test scores, budget cuts, or recipe adjustments. Knowing the percent makes it easy to compare with other percentages and quickly understand the size of the portion.