Let us assume the number of CDs your friend has = n Then Number of CDs that you have = n + 11 It is already given that the number of CDs you have = 30 Then n + 11 = 30 n = 30 - 11 = 19
From the above deduction, it can be easily concluded that the correct option among all the options that are given in the question is the fourth option or option "D". I hope that the answer has actually come to your desired help.