A project can be completed by A and B in 15 days. If team B works in 3 days and team A continues to work in 5 days, and only completes the whole project (7/30), how many days can team A work alone to complete?
一项工程，甲、乙两人合做15天完成，若乙队做3天，甲队接着做5天，只完成全工程的(7/30)，甲队单独做几天可以完成？
<gadget id="calculator">7 / 30</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">3 / 15</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(7/30) - (1/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">(1/30) / 2</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / (1/60)</gadget>
<output>60</output>

<result>60</result>