A project can be completed by team A alone in 15 days, team B alone in 12 days, and team C in 10 days alone. Now team A and team B work together for 5 days, and team C will do the rest alone. It will take a few more days to complete?
一项工程，甲队单独做15天完成，乙队单独做12天完成，丙队单独做10天完成现在甲、乙两队合做5天，余下的由丙队单独做，还要几天才能完成？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

<gadget id="calculator">(3/20) * 5</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/4) / (1/10)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>