This demo shows a simple method that takes in two inputs and returns the average:

private double average(double a, double b)

Solution

public class AverageMethod extends ConsoleProgram {

	public void run() {
		println(average(4, 5));
		println(average(10, 2));
		println(average(-4.1, 9.8));
	}

	private double average(double a, double b) {
		return (a + b) / 2;
	}
}