team A and team B cooperate to complete a project in 12 days. A works in 5 days and team B works in 8 days. The project can be completed (17/30). How many days will it take for A to complete the project alone?
一项工程甲、乙两队合作12天完成，甲做5天、乙做8天，可以完成这项工程的(17/30)，这项工程由甲单独完成需多少天．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">17 / 30</gadget>
<output>17/30 = around 0.566667</output>

<gadget id="calculator">(1/12) * 5</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(17/30) - (5/12)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">(3/20) / 3</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/12) - (1/20)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">1 / (1/30)</gadget>
<output>30</output>

<result>30</result>