It takes 10 hours for B to process a batch of parts alone. Now this batch of parts is equally distributed to A and B to process at the same time. A completes the task half an hour earlier than B, and then helps B to process 45 parts before completing all at the same time. How many parts are there in total?
加工一批零件，乙单独加工需10小时．现把这批零件平均分给甲、乙两人同时加工，甲比乙早半小时完成任务后又帮乙加工了45个才同时全部完成．这批零件共多少个．
<gadget id="calculator">10 + 9</gadget>
<output>19</output>

<gadget id="calculator">10 / 19</gadget>
<output>10/19 = around 0.526316</output>

<gadget id="calculator">9 / 19</gadget>
<output>9/19 = around 0.473684</output>

<gadget id="calculator">(10/19) - (9/19)</gadget>
<output>1/19 = around 0.052632</output>

<gadget id="calculator">2 / (1/19)</gadget>
<output>38</output>

<gadget id="calculator">45 * 38</gadget>
<output>1_710</output>

<result>1_710</result>