This is how I have been trying to solve it: 1/2 n + 2(N + 1) = 22, 2/1 . 1/2N + 2(N + 1) = 22 . 2/1, N + 2N + 2 = 44, 3N + 2 - 2 = 44 - 2, 3N = 42, 1/3 . 3N = 42 . 1/3, N = 14. 1/2(14) + 2(15) does not equal 22. The correct answer is N=8, but I have no idea how to solve it! Thanks for your help!