\(F_B=30lb\)
\(F_A=¿?\)
 
\(F_B=30\sin60\cdot6\cdot\frac{3}{5}\cdot9=FA\)
\(\frac{30\sin60\cdot6}{\frac{3}{5}}=\frac{259.80}{9}=28.86\)
\(F_A=28.9\)