Some task

Main.java

package com.company;

import java.util.Scanner;

public class Main {
    static Scanner in = new Scanner(System.in);
    
    private static int sumOfDigits(int num) {
        return num / 10 + num % 10;
    }
    
    static int[][] readValues() {
        int n = in.nextInt();
        int[][] kaf = new int[n][];
        for (int i = 0; i < n; i++) {
            int k = in.nextInt();
            kaf[i] = new int[k];
            for (int j = 0; j < k; j++) {
                kaf[i][j] = in.nextInt();
            }
        }
        return kaf;
    }

    public static void main(String[] args) {

        int[][] department = readValues();
        double maxAverage = 0;
        int departmentNumber = 1;
        for (int i = 0; i < department.length; i++) {
            int sum = 0;
            for (int j = 0; j < department[i].length; j++) {
                sum += department[i][j];
            }
            if (maxAverage < (double) sum / department[i].length) {
                maxAverage = (double) sum / department[i].length;
                departmentNumber = (i + 1);
            }
        }
        System.out.println(departmentNumber + " " + maxAverage);

    }
}