java importan problems for exam

Problem 15:

What is the output of  the following question

System.out.println(3*3/4*8+99/3*4+3);

Output:

1 51

Problem 16:

What is the output of  the following question

System.out.println(3*3/4*8+992/3.0*4+3);

Output:

1341.6666666666667

Problem 17:

What is the output of  the following question

System.out.println(3*3+999/4*8+992/3.0*4+3);

Output:

3326.666666666667