During an outing, Katherine picked 20 more apples than Noah, and Ryan picked 60 more than Noah. Altogether, the three of them picked 239 apples. How many apples did Ryan pick?

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.