Java Taskbook Level 4.5

Print to the console all numbers from 1 to 1000, the sum of the digits of which is equal to 13.

The values given are in pixels and contain integers:

String size1 = "12px";
String size2 = "15px";

Add these values together so that the result is also in pixels:

"28px"

Given an array:

int[] {1, 2, 3}

Create a new array so that each element of the first array is repeated twice:

int[] {1, 1, 2, 2, 3, 3}

Given an array:

int[] arr = {1, 2, 3, 4, 5};

Create a new array such that the new array contains all the elements of the first array except for the first N elements.