conversations.from: human
conversations.value: Find a solution for this math problem: Bran's tuition fee is $90. He does a part-time job that pays him $15 per month and he has a scholarship that takes care of 30% of his tuition fee. If he needs to pay his tuition fee within 3 months, how much does Bran still need to pay?
conversations.from: assistant
conversations.value: Bran's scholarship pays $90 x 0.30 = $27 to his tuition fee.
  So, the total amount he still needs to pay is $90 - $27 = $63.
  And Bran will be able to earn $15 x 3 = $45 after working for 3 months.
  Therefore, the total amount he still needs to pay is $63 - $45 = $18.