conversations.from: human
conversations.value: Solve the math problem: Lowry sells bonsai. A small bonsai costs $30 and a big bonsai costs $20. If he sold 3 small bonsai and 5 big bonsai, how much did he earn?
conversations.from: assistant
conversations.value: Lowry earns $30 x 3 = $90 from selling 3 small bonsai.
  He earned $20 x 5 = $100 from selling 5 big bonsai.
  Therefore, the total amount he earned is $100 + $90 = $190.