Required information

In the given figure, the horizontal platform ABCD weighs $60-1b$ and supports a $390-1b$ load at its center. The platform is normally held in position by the hinges at A and $B$ and by braces $CE$ and $DE.$ Consider brace $DE$ is removed. The hinge at A does not exert any axial thrust.

Determine the reactions at hinges and the force exented by the remaning brace CE Unchude a minus sign if necessary$)$

The force exerted by the brace CE is $6.$

The reaction at A is $($b$)$ L $.$

The reaction at B &s I $($b$)i-1|(b)j+1||$ lby $k.$