A project can be completed in 12 days by the cooperation of teams A and B. If Team A works for 6 days first, and Team B continues for 10 days, at this time (7/10) of the project is just completed. If Team A completes this project alone, how many days will it take in total?
一项工程，甲乙两队合做12天可以完成．如果甲队先做6天，乙队接着做10天，这时正好完成这项工程的(7/10)，如果由甲队单独完成这项工程，一共需要多少天？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(1/12) * 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(7/10) - (1/2)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 - 6</gadget>
<output>4</output>

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