public class NumberPuzzles4 { public static void main(String[] args) { for (int a = 1; a < 100; a++) for (int b = 1; b < 100; b++) for (int c = 1; c < 100; c++) for (int d = 1; d < 100; d++) { if (a + b + c + d == 45 && a+2 == b-2 && a+2 == c*2 && a+2 == d/2.0) System.out.println(a + " " + b + " " + c + " " + d); } } }