Use a steel pipe with a length of 36 decimeters to make a cuboid model with a width of 3 decimeters and a height of 2 decimeters. What is its length?
用一根长36分米的钢管，做一个宽3分米，高2分米的长方体模型，它的长是多少分米？
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<result>4</result>