ACT Problem 54

$$\begin{array}{lcl} 54.\; John\;scores\;7,\;11\;and\;0\;when\;throwing\;dart.\\What\;must\;he score\;on\;the\;fourth\;arrow\;in\;order\\to\;have\;an\;average\;of\;5?\\ \\ (F)\;5\\ (G)\;3\\ (H)\;2\\ (J)\;10\\ (K)\;8\\ \end{array}$$