21.6/0.8-1.2*5.
21.6/0.8-1.2*5．
<gadget id="calculator">21.6 / 0.8</gadget>
<output>27</output>

<gadget id="calculator">1.2 * 5</gadget>
<output>6</output>

<gadget id="calculator">27 - 6</gadget>
<output>21</output>

<result>21</result>