conversations.from: human
conversations.value: Ernest bought 50 meters of wire and cut it into 5 equal parts. He then used 3 parts of the wire. How many meters of wire is not used?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: Each part of the wire is 50/5 = 10 meters long.
  Ernest used 3 parts, then he used 10 x 3 = 30 meters of the wire.
  Therefore, 50 - 30 = 20 meters of wire is not used.