conversations.from: human
conversations.value: A ship left a port and headed due west, having 400 pounds of food for the journey's supply. After one day of sailing, 2/5 of the supplies had been used by the sailors in the ship. After another two days of sailing, the sailors used 3/5 of the remaining supplies. Calculate the number of supplies remaining in the ship to last the sailors until they dock.
  How to solve this?
conversations.from: assistant
conversations.value: After one day of sailing, 2/5*400 = 160 pounds of food supplies had been used.
  The total number of supplies remaining in the ship is 400-160 = 240 pounds.
  After another 2 days of sailing, 3/5*240 = 144 pounds of food had been used.
  The total number of supplies remaining in the ship is now 240-144 = 96 pounds.