There are 515 students who attend central middle school. Three out of every 5 students live within 1 mile of the school. How many students at central middle school live within 1 mile of the school?

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.