question: Digimon had its 20th anniversary.  When it came out John was twice as old as Jim.  If John is 28 now how old is Jim?
answer: When Digimon came out John would have been 28-20=<<28-20=8>>8
  So Jim was 8/2=<<8/2=4>>4 years old
  That means John is now 4+20=<<4+20=24>>24
  #### 24