public class Main { public static void main(String[] args) { int[][] arr = {{11,33,55},{22,44,66,88},{131,214,315,146},{928,827,726,625},{424,525}}; int sum=add(arr); System.out.println(sum); } public static int add(int[][] arr) { int sum=0; //write your code here...... int len1 = arr....