A square iron wire with a side length of 15 decimeters forms a rectangle with a length of 18 decimeters. What is the width of the rectangle? Answer: What is the width of the rectangle in decimeters?
一个边长是15分米的正方形铁丝，围成一个长是18分米的长方形，长方形的宽是多少分米？答：长方形的宽是多少分米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 18</gadget>
<output>12</output>

<result>12</result>