A and B together complete a batch of parts. The working efficiency ratio of A and B is 5:6. When A completes the task, A makes 350 parts. How many parts are there in total?
甲、乙两人共完成一批零件，甲、乙工作效率比是5：6，完成任务时甲做了350个，这批零件共多少个？
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">350 / (5/11)</gadget>
<output>770</output>

<result>770</result>