question: A glass of milk is 8 ounces of milk.  John drinks 2 glasses of milk.  If milk has 3 calories per ounce how many calories did he consume?
answer: He drank 8*2=<<8*2=16>>16 ounces of milk
  So he drank 16*3=<<16*3=48>>48 calories of milk
  #### 48