24/86 as a percentage is 27.91%. This is the rounded value you get when you look at the fraction in a percent format.
The fraction 24/86 can be thought of as a part of a whole. If you imagine 86 equal pieces, 24 of those pieces are taken, which represents just under a third of the whole.
Knowing that 24/86 equals 27.91% can help when comparing it to other percentages, such as test scores or discounts. It gives a quick sense of scale without dealing with the fraction directly.