My work:

E= Kq / r^2

E= (9 x 10^9 NxM^2/C^2)(30.0 x 10^-9 C)/ (0.30m)^2

i get 3000 N/C

E= (9x10^9 NxM^2/C^2)(60 x 10^-9 C)/(0.30m)^2

i get 6000 N/C

i added the two together and got 9000N/C, but its telling me the answer is "12.0 x 10^3N/C toward 30 nC"

i am confused on what i am doing wrong. please help