What is the average of the following numbers 18, 15, 17, 19 and 16? * 1 point A.14 B.15 C.16 D. 17 21. Which operation should you do first? 9 – 5 + 3 * 1 point A. Addition B. Subtraction C. Multiplication D. Division 22. 8 + 12 ÷ 4 * 1 point A. 11 B. 12 C. 13 D. 14 23. 18 – 3 – 2 x 4 * 1 point A. 5 B. 7 C. 9 D. 11 24. Which operation should you do first? 12 – 3 + 18 ÷ 6 x 3 * 1 point A. Addition B. Subtraction C. Multiplication D. Division 25. 15 + 2 – 14 ÷ 7 * 1 point A. 15 B. 16 C. 17 D. 18 ​