25/49 as a percentage is 51.02%. This rounded figure tells you a little more than half of a whole when you look at the fraction in everyday terms.
The fraction 25/49 is already in its simplest form, meaning the numerator and denominator share no common factors other than 1. As a decimal it is about 0.5102, which lines up directly with the percentage you see above.
In practical situations, you might use this value to compare parts of a group, calculate grades, or estimate probabilities. Knowing that 25 out of 49 items represent roughly 51.02% makes it easy to communicate the size of a portion without needing a calculator.