conversations.from: human
conversations.value: John has a large water collection tank.  The tank can hold 200 gallons.  It weighs 80 pounds empty.  A rainstorm fills it to 80% of capacity.  If a gallon of water weighs 8 pounds, how much does it weigh now?
  How to solve this?
conversations.from: assistant
conversations.value: The tank has 200*.8=160 gallons of water in it
  That water weighs 160*8=1280 pounds
  So in total it weighs 1280+80=1360 pounds