23.The average (arithmetic mean) of the 5 positive integers U, V, X, Y, and Z is 16, and U

23. The average (arithmetic mean) of the 5 positive integers U, V, X, Y, and Z is 16, and U < V < X < Y < Z. If Z is 40, what is the greatest possible value of the median of the 5 integers? 16 18 19 20 22