20/49 as a percentage is 40.82%. This fraction represents a little less than half of a whole, and the percentage shows that value in a familiar format.
When you look at 20/49, you can see it is close to 20 out of 50, which would be exactly 40%. The extra one in the denominator makes the value a bit higher, landing at the rounded 40.82%.
People often use this kind of conversion when comparing parts of a group, such as survey results or test scores. Knowing that 20 out of 49 is 40.82% helps you quickly understand the proportion in everyday terms.