A piece of iron wire can form a square with a side length of 15 cm. If the wire is cut off by 8 cm, what is the side length of the square that can be formed?
一段铁丝能围成边长为15厘米的正方形，如果将铁丝剪去8厘米，能围成的正方形的边长是多少厘米
<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">60 - 8</gadget>
<output>52</output>

<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<result>13</result>