Answer :
its 15 ft by 20ft
u can find the longer side of room B by calculating 12×2-4=20
then u make it 12/16=x/20
the x represent the length
and by calculating u wil find 15
u can find the longer side of room B by calculating 12×2-4=20
then u make it 12/16=x/20
the x represent the length
and by calculating u wil find 15