java conceptual input output problems

Question 03

Show the output of the following .

int i=9,j=8,k=4;

System.out.println(i+k*9/2+k);

System.out.println(i+k*9.0/2+k);

System.out.println(j+k*3/3*1.0+8);

Output:

31

31.0

20.0