If a ribbon can be used to form a rectangle with a length of 5 decimeters and a width of 3 decimeters. Think about it, use this ribbon to form a square, how many decimeters is its side length?
如果用一根彩带能围成一个长为5分米，宽为3分米的长方形．想一想，用这根彩带围成一个正方形，它的边长是多少分米？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>