Answer
$$
M_A=362 \mathrm{lb} \cdot \text { in (Clockwise) }
$$
Work Step by Step
$$
\begin{aligned}
↺+M_A & =-20 \cos 30^{\circ}(18)-20 \sin 30^{\circ}(5) \\
& =-361.77 \mathrm{lb} \cdot \text { in }=362 \mathrm{lb} \cdot \text { in }(\text { Clockwise })
\end{aligned}
$$
