The fraction 15/21 is equal to 71.43% when converted to a percentage. This means that if you had 21 items and took 15 of them, you'd have about 71% of the total. It's a bit more than two-thirds but not quite three-quarters of the whole amount.
In everyday life, you might see this fraction or percentage used in various situations. For example, if 15 out of 21 students in a class passed a test, you could say that 71.43% of the class succeeded. Or if a sports team won 15 games out of 21 played in a season, their winning percentage would be 71.43%. This percentage shows a pretty good success rate in most contexts.
