conversations.from: human
conversations.value: I'm stuck on this math problem: John is 10 years old. His sister is twice his age. When he is 50 years old, how old will his sister be?
  Can you help?
conversations.from: assistant
conversations.value: His sister is 10*2= 20 years old
  Their age difference is 20-10= 10 years
  Therefore when he is 50 she will be 50+10= 60 years old.