It follows the below logic 2 + 5 = 7 7 + 20 = 27 27 + 80 = 107 107 + 320 = 427 Then, 5 x 4 = 20 20 x 4 = 80 80 x 4 = 320 Therefore, 320 x 4 = 1280 The number is 427 + 1280 = 1707