Four fifths of the members of a club are female. three-quarters of these females are over 20 years old. what fraction of the members of the club are females over 20 years old? show your working ! so much!

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.

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

What are the exclude value of mn+3m