You may recall how in grade school you did division like this:

13 / 5 == 2 with a remainder of 3.

This is because 13 == 2*5 + 3.

The symbol for finding the remainder is % (percent sign). If you look in the operators, table of table of operators you will see that it has the same precedence as / and *. Here is a program:

public class RemainderExample
{
  public static void main ( String[] args )
  {
    int quotient, remainder;
    quotient  =  17 / 3;
    remainder =  17 % 3;
    
    System.out.println("The quotient : " + quotient );
    System.out.println("The remainder: " + remainder );
    System.out.println("The original : " + (quotient*3 + remainder) );
  }
}

Question 14:
Will the following always print out the original integer, regardless of what it was?
System.out.println("The original : " + (quotient*3 + remainder) );