question: John had a son James when he was 19.  James is now twice as old as his sister Dora, who will turn 12 in 3 years.  How old will John's youngest son, who was born when John was 32, be in 3 years?
answer: Dora is 12-3=<<12-3=9>>9
  So James is 9*2=<<9*2=18>>18 years old
  That means John is 18+19=<<18+19=37>>37
  Johns youngest son is 37-32=<<37-32=5>>5 years old
  So he will be 5+3=<<5+3=8>>8 in 3 years
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