conversations.from: human
conversations.value: Can you give me some step-by-step instructions for this math problem: Mr. Ruther sold 3/5 of his land and had 12.8 hectares left. How much land did he have at first?
conversations.from: assistant
conversations.value: Mr. Ruther is left with 1 - 3/5 = 2/5 of his land.
  Since 2/5 is equal to 12.8 hectares, then 1/5 is equal to 12.8/2 = 6.4 hectares.
  Hence, Mr. Ruther had 6.4 x 5 = 32 hectares of land at first.