On a rectangular ground with a length of 35m and a width of 26m, two vertical roads with the same width should be built (both roads are parallel to one side of the rectangle), and the rest should be planted with flowers and plants. What is the width of the road to make the remaining area reach 850㎡? (Is this a corpse? ) solution: let the road width be x.

Then (35*26-850)=(35X+26X-X2)

X2 (squared) -6 1x+60=0.

The solution is x= 1.