conversations.from: human
conversations.value: Can you guide me through solving this problem: Megan is an actress. She was the lead actress in 80% of her work. In total, Megan participated in 100 plays. How many times Megan was not the lead actress?
conversations.from: assistant
conversations.value: Megan was the lead actress in 100 * 80% = 80 plays.
  So Megan was not the lead actress in 100 - 80 = 20 plays.