conversations.from: human
conversations.value: John has started at a job he works every day 10 days ago.  So far, he's made $250.  How many more days must John work before he makes twice this amount, assuming he makes the same amount every day?
  Can you solve this problem?
conversations.from: assistant
conversations.value: John has made $250 in 10 days, so this means he makes $250/10=25 dollars a day.
  Since John wants to make double his current amount, this means he wants to make 250*2=500 dollars
  This means John needs to work 500/25= 20 days in total to make 500.
  As John has already worked 10 days, this means he needs to work 20-10=10 more days to make his goal.