conversations.from: human
conversations.value: I would love to understand how to solve this problem: James has 20 years of experience.  8 years ago John had twice as much experience as James.  Mike started when John had 16 years of experience.  What is their combined experience?
  Can you explain?
conversations.from: assistant
conversations.value: 8 years ago James had 20-8=12 years
  So 8 years ago John had 12*2=24 years experience
  That means John has 24+8=32 years experience
  So Mike has 32-16=16 years of experience
  So together they have 20+32+16=68 years experience