During the summer vacation, the school was redecorated and the playground was expanded. The school extended the square playground to the north by 10 meters. Now the total area is 3000 square meters. What was the original side length of the playground?
暑假期间，学校进行了重新装修，操场进行了扩建，学校将正方形的操场向北延伸10米，现在总面积3000平方米，问操场原来边长是多少？
<result>50</result>