canal can be dug by team A in 120 days and by team B in 40 days. Now the two teams are digging together for 8 days, and the rest will be repaired by team C, and it will take another 12 days to finish digging. This canal is repaired by Team C alone. How many days can it be completed?
一条水渠，甲队独挖120天完成，乙队独挖40天完成．现在两队合挖8天，剩下的由丙队加入一起修，又用12天挖完．这条水渠由丙队单独修，多少天可以完成？
<gadget id="calculator">1 / 120</gadget>
<output>1/120 = around 0.008333</output>

<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/120) + (1/40)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 8</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">1 - (4/15)</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">(11/15) / 12</gadget>
<output>11/180 = around 0.061111</output>

<gadget id="calculator">(11/180) - (1/30)</gadget>
<output>1/36 = around 0.027778</output>

<gadget id="calculator">1 / (1/36)</gadget>
<output>36</output>

<result>36</result>