Average.java

public class Average
{
    static int[] avg = {45, 56, 34, 89};
    static long first = 2000000;
    static long second = 4000000;
    public static void main(String[] args) 
    {
        PrintAll();
        PrintSum();
        PrintAverage();
    }
    public static void PrintAll() 
    {
        for (int i = 0; i < avg.length; i++) {
            System.out.println(avg[i]);
        }
    }
    public static int CalSum() 
    {
        int ans = 0;
        for (int i = 0; i < avg.length; i++) {
            ans = ans + avg[i];
        }
        return ans;
    }
    public static void PrintSum() 
    {
        System.out.println(CalSum());
    }
    public static void PrintAverage() 
    {
        System.out.println(CalSum()/avg.length);
    }
    public static void Print() 
    {
        long result = first * second;
        System.out.println(result);
    }
}

VolumeConversion.java

public class VolumeConversion
{
    public static final double GToL = 4.546;
    public static double gallons = 14;
    public static double litres; 
    public static String lit = "The number of litres in ";
    public static String gal = " gallons is ";
    public static void main(String[] args)
    {   
        litres = gallons * GToL;
        
        // Complete output with appropriate text
        
        System.out.println(lit + gallons + gal + litres);
    }
}