Номер 413

25 + 43 + 35 + 37 + 20 = (25 + 35) + (43 + 37) + 20 = 60 + (80 + 20) = 60 + 100 = 160;

180 + 230 + 20 + 70 = (180 + 20) + (230 + 70) = 200 + 300 = 500.