Question 303899
Let's the length be L and the width be w 

L = 2w 

Area of the flag = L*w = 2w*w = 2w^2 

{{{2w^2 = 1250 cm^2 }}}

{{{ w^2 = 1250/2 }}}

{{{ w = sqrt(625)}}}

w = 25 cm 

Answer: the width of the flag is 25cm