Problem 334 | Equilibrium of Parallel Force System

$7.5R_1 = 6(12) + 4.5[ \, 3(6) \, ] + 1[ \, \frac{1}{2}(3)(15) \, ]$

$R_1 = 23.4 \, \text{ kN}$           answer
 

$\Sigma M_{R1} = 0$

$7.5R_2 = 1.5(12) + 3[ \, 3(6) \, ] + 6.5[ \, \frac{1}{2}(3)(15) \, ]$

$R_2 = 29.1 \, \text{ kN}$           answer