43.48% is what you get when you turn the fraction 20⁄46 into a percentage.
The fraction 20⁄46 can be simplified to 10⁄23, which is still a little more than one‑half. It shows up in everyday situations, like when you have 20 out of 46 items and want to know the portion in a more familiar form.
Knowing the percentage helps you compare that portion to other numbers quickly. For example, if a test score is 20 out of 46 points, you earned roughly 43.48% of the total possible points.