A project requires 30 days to be completed by A and B working together, and 45 days for B to do it alone. Now, A and B have worked together for 6 days, and B will do the rest alone. May I ask: How many days will it take to complete?
一项工程，甲、乙两人合作需要30天完成，乙单独做需要45天，现在，甲乙合作了6天，剩下的由乙单独做，请问：还需要多少天才能完成？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 6</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) / (1/45)</gadget>
<output>36</output>

<result>36</result>