the complete question in the attached figure
we know that
angle E+angle F+angle G+angle H=360°
9X+14X+4X+90=360°
27X+90=360°
27X=360-90
27X=270-------------> x=270/27------------> x=10°
angle F=14x---------> 14*10---------> 140°
the answer is
angle F is 140°
