I need help does anyone know this?

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

The sum of two numbers is 86, and their difference is 20. find the two numbers

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?