Sum of vertical forces
$R = \Sigma F_v$
$13.6 = 18 - F + 27$
$F = 31.4 \, \text{ kg}$ downward
Moment about point A
$Rd = \Sigma Fx$
$13.6(3) = 18(0.6) - 31.4x + 27(4)$
$x = 2.48 \, \text{ m}$
Thus, F = 31.4 kg downward at 2.48 m to the right of left support. answer