Can anyone guide me through this one please?

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.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?