question: How many years longer is the male and female national average combined over those rates for the county?
#1 return males 
#2 return females 
#3 return national average in  years of #1 
#4 return national average in  years of #2 
#5 return county average in  years of #1 
#6 return county average in  years of #2 
#7 return sum of #3 and  #4 
#8 return sum of #5 and  #6 
#9 return the  difference of #7 and  #8