prompt: Tommy wants to earn enough money to buy 8 new books. Each book costs $5. If Tommy already has $13, how much does he need to save up?
messages.content: Tommy wants to earn enough money to buy 8 new books. Each book costs $5. If Tommy already has $13, how much does he need to save up?
messages.role: user
messages.content: The books will cost $40 because 8 x 5 = <<8*5=40>>40
  He needs to save up $27 because 40 - 13 = <<40-13=27>>27
  #### 27
messages.role: assistant