A school playground is rectangular and has a length of 50 cm and a width of 30 cm. A safety zone of uniform width surrounds the playground. If the area of the safety zone equals the area of the playground, what is the width of the safety zone, to 2 decimal places?
Total area of zone and playground, (x+50)(x+30); and this whole area is twice the area of the playground, consistent with description. highlight_green%28%28x%2B50%29%28x%2B30%29=2%2A50%2A30%29; Solve for x.
