Xiao Li, Xiao Wang and Xiao Zhang each made 120 of the same machine parts at the same time. When Xiao Wang finished, Xiao Li made 100 and Xiao Zhang made 50. Then when Xiao Li finished, Xiao Zhang also How many did not do.
小李，小王和小张同时各做120个同样的机器零件，当小王做完时，小李做了100个，小张做了50个，那么当小李做完时，小张还差多少个没做．
<gadget id="calculator">120 - 100</gadget>
<output>20</output>

<gadget id="calculator">100 / 50</gadget>
<output>2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<gadget id="calculator">120 - 50 - 10</gadget>
<output>60</output>

<result>60</result>