Use a 3.6m long iron wire to make a cuboid frame with a length of 0.4m and a width of 0.3m. What is the height of the frame?
用一根长3.6m的铁丝，做成一个长0.4m，宽0.3m的长方体框架，这个框架的高是多少．
<gadget id="calculator">3.6 / 4</gadget>
<output>0.9</output>

<gadget id="calculator">0.4 + 0.3</gadget>
<output>0.7</output>

<gadget id="calculator">0.9 - 0.7</gadget>
<output>0.2</output>

<result>0.2</result>