After selling \(\frac { 1 } { 3 } \) of the muffins he made for the school bake sale, Alan then sold an additional 10 muffins, leaving him with \(\frac { 1 } { 2 } \) of the number of muffins he started with. How many muffins did Alan start with?
(A)30 (B)42 (C)50 (D)60 (E)75
D