For one project, Team A works alone for 16 days, and the remaining team B will complete it in 25 days; after team B works alone for 35 days, Team A will complete the remaining project alone in 8 days. If teams A and B cooperate from the beginning, how many days can the task be completed?
一件工程，甲队先单独做16天后，剩下的乙队还要25天完成；乙队先单独做35天后，剩下的工程甲队单独做，还要8天完成．如果一开始就由甲、乙两队合作，多少天可以完成任务？
<gadget id="calculator">35 / 45</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 - (7/9)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">8 / (2/9)</gadget>
<output>36</output>

<gadget id="calculator">1 / 36</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">1 / 45</gadget>
<output>1/45 = around 0.022222</output>

<gadget id="calculator">(1/36) + (1/45)</gadget>
<output>1/20 = around 0.05</output>

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

<result>20</result>