Put 20 colored flags on the four sides of a square playground. There should be the same number of colored flags on each side, and one at each vertex. How many colored flags can be inserted on each side.
把20面彩旗插在正方形操场上的四条边上，每条边上的彩旗要一样多，每个顶点也要插一面，每条边上可插多少面彩旗．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>