conversations.from: human
conversations.value: Can you walk me through the solution of: If it takes 10 people 10 days to shovel 10,000 pounds of coal, how many days will it take half of these ten people to shovel 40,000 pounds of coal?
conversations.from: assistant
conversations.value: The 10 people shovel 10,000 pounds per 10 days, or 10,000/10=1000 pounds per day per 10 people.
  And 1000 pounds per day per 10 people is 1000/10=100 pounds per day per person.
  Half of ten people is 10/2=5 people.
  At 100 pounds per day per person, 5 people can shovel 5*100=500 pounds per day.
  Therefore, for 5 people to shovel 40,000 pounds, it will take 40,000/500=80 days.