conversations.from: human
conversations.value: A 10 meters yarn was cut into 5 equal parts. If 3 parts were used for crocheting, how long was used for crocheting?
  Solve it.
conversations.from: assistant
conversations.value: Each part is 10/5 = 2 meters long.
  Therefore, 2 x 3 = 6 meters of yarn were used for crocheting.