human
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?
assistant
How many pounds of coal do the 10 people shovel in a day? ** The 10 people shovel 10,000 pounds per 10 days, or 10,000/10=<<10000/10=1000>>1000 pounds per day per 10 people.
How many pounds of coal does each person shovel in a day? ** And 1000 pounds per day per 10 people is 1000/10=<<1000/10=100>>100 pounds per day per person.
How many people are half of the ten people? ** Half of ten people is 10/2=<<10/2=5>>5 people.
How many pounds of coal can 5 people shovel in a day? ** At 100 pounds per day per person, 5 people can shovel 5*100=<<5*100=500>>500 pounds per day.
How many days will it take 5 people to shovel 40,000 pounds of coal? ** Therefore, for 5 people to shovel 40,000 pounds, it will take 40,000/500=<<40000/500=80>>80 days.
#### 80