prompt: Bob buys nose spray.  He buys 10 of them for a "buy one get one free" promotion.  They each cost $3.  How much does he pay?
messages.content: Bob buys nose spray.  He buys 10 of them for a "buy one get one free" promotion.  They each cost $3.  How much does he pay?
messages.role: user
messages.content: He got 10/2=<<10/2=5>>5 paid
  That means he paid 5*3=$<<5*3=15>>15
  #### 15
messages.role: assistant