Q$3$:

$1-$ Find Force in $CD$ and $CH$ using method of section

$2-$ Find Force in IO using method of joint.

$P=$ Last $2$ student $ID+20=41$

$Q=$ Last $2$ student $ID+35=56$

uarr$-6$ bays each bay$)ft($equally spaced$)$

$A=$ Last $1$ student $ID+3=4$

$B=A^{**}2=16$