Posted on October 5, 2017 by admin Adding 10, 15, 20, 25, …, Practice 1 20 + 10 25 + 45 45 + 40 30 + 25 35 + 15 30 + 30 10 + 15 15 + 5 35 + 35 20 + 30 Post navigationPrevious post: Adding 20, Practice 3Next post: Question #1