cuboid whose length and width are 172dm and whose length and width are 23dm, what is its height in dm?
一个棱长和是172dm的长方体，它的长和宽之和为23dm，它的高是多少dm．
<gadget id="calculator">172 / 4</gadget>
<output>43</output>

<gadget id="calculator">43 - 23</gadget>
<output>20</output>

<result>20</result>