$$112-64=48$$  $$64-48=16$$ 
Tower $$A$$ is $$\rm 64 m$$ high.The total height of Tower $$A$$ and Tower $$B$$ is $$\rm 112 m$$.What is the difference between the height of the two towers?~\uline{~~~~~~~~~~}~$$\rm m$$. 
Options:
  $$14$$ 
  $$15$$ 
  $$16$$ 
  $$17$$ 
  $$18$$ 