A and B work together to process 100 parts, A processes 10 parts per hour, and B processes 8 parts per hour. In the first 3 hours before completing the task, how many parts are left unprocessed.
甲乙两人共同加工100个零件，甲每小时加工10个，乙每小时加工8个，在完成任务的前3小时，还剩多少个零件没有加工．
<gadget id="calculator">10 + 8</gadget>
<output>18</output>

<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>