#"The length of the flag "=4ft6"inch"=4.5ft"#
#"The Breadth of the flag "=2ft9"inch"=2.75ft#
#"The width of the blue cross "=9"inch"=0.75ft#
#"The area of blue cross"=((4.5+2.75)xx0.75-(0.75)^2)"ft^2#
#=4.875ft^2#
#"Total area of the flag"=4.5xx2.75ft^2=12.375ft^2#
So
#"Fraction occupied by the blue cross"=4.875/12.375=13/33#