24/42 as a percentage is 57.14%. This is the rounded value you get when you express the fraction in percent form.
The fraction 24/42 can be simplified to 4/7, which is a common ratio you might see in recipes or in measuring parts of a whole. Seeing it as a percent makes it easier to compare with other percentages you encounter daily.
Using 57.14% lets you quickly understand that a little more than half of something is represented by 24 out of 42 parts. Percentages like this are handy for budgeting, grading, and many other everyday calculations.