Answer: For 600 ppl: 84 & for 650 ppl: 91
Explanation:
If the average is 1.4 of 10 ppl, you can use that to solve for 600 people and for 650 people.
Divide 600 by 10, and you get 60.
Multiply that by 1.4, and you get 84, which is the answer.
For 650 people:
Divide 650 by 10, and you get 65.
Multiply that by 1.4, and you get 91, which is the answer.