conversations.from: human
conversations.value: Explain how to solve this math problem: A jellyfish tank has numerous jellyfish in it. A fifth of the jellyfish are large, and a third of the large jellyfish change color from green to blue under UV light. The other jellyfish are small and always stay blue. When a UV light turned on, 6 jellyfish changed color. How many jellyfish are in the tank?
conversations.from: assistant
conversations.value: A third of the large jellyfish change color, so there are 6 * 3 = 18 large jellyfish.
  A fifth of the jellyfish are large, so there are 18 * 5 = 90 jellyfish in the tank.