conversations.from: human
conversations.value: I would love to understand how to solve this problem: Tom fills a 250 pound sandbag 80% full.  But the filling material he is using is 40% heavier than sand.  How much does the bag weigh?
  Can you explain?
conversations.from: assistant
conversations.value: The bag full of sand would weigh 250 * .8 = 200 pounds
  The filling material would make it 200 * .4 = 80 pounds heavier
  So it weighs 200 + 80 = 280 pounds