Answer: (18.6 - 3) ÷ 4 = 3.9 million people or (18.6 - 3) ÷ 4 = p
Step-by-step explanation: If you start out with 18.6 million and it is 3 times more than the population you need to find, you have to deduct that from the total now. That brings us to 15.6. If the population is 4 times more, than you need to divide it by 4 to get 3.9 million.