Xiao Wang, Xiao Li and Xiao Zhang each make 120 of the same machine parts at the same time. When Xiao Wang finishes, Xiao Li makes 100 and Xiao Zhang makes 60. According to this calculation, when Xiao Li finishes, How many more did Xiao Zhang fail to do.
小王、小李和小张，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60个，照这样计算，小李做完时，小张还差多少个没做．
<gadget id="calculator">60 * 120</gadget>
<output>7_200</output>

<gadget id="calculator">7_200 / 100</gadget>
<output>72</output>

<gadget id="calculator">120 - 72</gadget>
<output>48</output>

<result>48</result>