$\Sigma M_A = 0$
$9R_B = (3 + 1.5)(20 \cos 30^\circ) + (9 + 3)(20 \sin 30^\circ)$
$9R_B = 197.94$
$R_B = 21.99 \, \text{ kN}$ answer
$\Sigma F_H = 0$
$A_H = 20 \cos 30^\circ$
$A_H = 17.32 \, \text{ kN}$
$\Sigma M_B = 0$
$9A_V = 1.5A_H + 3(20 \cos 30^\circ) + 3(20 \sin 30^\circ)$
$9A_V = 1.5(17.32) + 3(20 \cos 30^\circ) + 3(20 \sin 30^\circ)$
$9A_V = 107.94$
$A_V = 11.99 \, \text{ kN}$
$R_A = \sqrt{{A_H}^2 + {A_V}^2}$
$R_A = \sqrt{17.32^2 + 11.99^2}$
$R_A = 21.06 \, \text{ kN}$
$\tan \theta_{Ax} = \dfrac{A_V}{A_H}$
$\tan \theta_{Ax} = \dfrac{11.99}{17.32}$
$\theta_{Ax} = 34.7^\circ$
Thus,
RA = 21.06 kN down to the left at 34.7° with the horizontal. answer