A project can be completed by team A in 12 days, team B in 10 days, and team C in 15 days. If three teams work together for 3 days, how much of the entire project is left unfinished.
一项工程，甲队独做12天完成，乙队独做10天完成，丙队独做15天完成．如果三队合做3天，还剩全部工程的多少没完成．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

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

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

<gadget id="calculator">(1/12) + (1/10) + (1/15)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 3</gadget>
<output>3/4 = around 0.75</output>

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

<result>1/4 = around 0.25</result>