Suppose you have 30 CDs. You know that you have 11 . more CDs than your friend. Write and solve an . equation to find the number of CDs your friend has.. . A. n – 11 = 30; 41. . B. 30 + n = 11; –19. . C. 30 + 11 = n; 41. . D. n + 11 = 30; 20