15/55 as a percentage is 27.27%. This number tells you how much of a whole the fraction represents when you think of the whole as 100 parts.
The fraction 15/55 can be simplified by dividing both the top and bottom numbers by 5, giving you 3/11. Even though the numbers are smaller, the value stays the same, so it still equals 27.27% of a whole.
In everyday use, you might see this percentage when comparing parts of a group, like 15 out of 55 students who passed a test. Saying 27.27% makes it clear how large that portion is compared to the entire group.
