Question 120428
the area of the room is 10*12 or 120 ft² __ two-thirds of this is 80 ft²


let x="width of uniform strip", so the rug length is 12-2x and the width is 10-2x


using the area __ (12-2x)(10-2x)=80 __ 120-44x+4x^2=80 __ 30-11x+x^2=20


x^2-11x+10=0 __ (x-10)(x-1)=0