conversations.from: human
conversations.value: Find the answer to the math problem: Tilly needs to sell 100 bags at $10 per bag to make $300 in profit. How much did she buy each bag for?
conversations.from: assistant
conversations.value: Tilly will make 100 x $10 = $1000 in total
  She has spent $1000 - $300 = $700 on 100 bags
  Each bag cost Tilly $700 / 100 = $7