Master Wang needs to process 120 parts, and 80% of them have been processed. How many parts are left?
王师傅要加工120个零件，已经加工了80%，剩下的比已经加工的少多少个？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 * (4/5)</gadget>
<output>96</output>

<gadget id="calculator">120 - 96</gadget>
<output>24</output>

<gadget id="calculator">96 - 24</gadget>
<output>72</output>

<result>72</result>