conversations.from: human
conversations.value: Can you walk me through the solution of: Jim has 2 rows of 4 trees to start.  When he turns 10 he decides to plant a new row of trees every year on his birthday.  On his 15th birthday after he doubles the number of trees he has.  How many trees does he have?
conversations.from: assistant
conversations.value: He started with 2*4=8 trees
  He plants trees for 15-10=5 years
  So he planted 5*4=20 trees
  So he had 20+8=28 trees
  After doubling them he had 28*2=56 trees