## Question:

Replace this system by an equivalent resultant force and couple moment acting at $O$. Express the results in Cartesian vector form.

Given:

${ F }_{ 1 }$ = $50$ $N$

${ F }_{ 2 }$ = $80$ $N$

${ F }_{ 3 }$ = $180$ $N$

$a$ = $1.25$ $m$

$b$ = $0.5$ $m$

$c$ = $0.75$ $m$