A project A alone takes 12 days to complete, and B can complete the project in 5 days (1/3). Now A and B work together for 2 days, and the rest is done by A alone, how many days will it take to finish?
一项工程甲单独做要12天完成，乙5天能完成这个工程的(1/3)．现在甲、乙两人合做2天，余下的由甲单独完成，还要多少天能做完？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">5 / (1/3)</gadget>
<output>15</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/12) + (1/15)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) / (1/12)</gadget>
<output>42/5 = around 8.4</output>

<result>42/5 = around 8.4</result>