Answer:
8 people
Explanation:
3 people to do the job in 16 hours so each of the people will mow 1/3 of the lawn during the 16 hours.
So if was a single person was mowing the lawn would take them 3 times longer 16*3 =48 hours
To mow the lawn in 6 hours will need 48 hours to be split in 6 hours so will get 48/6 = 8 people.