project was first completed by teams A, B, and C in 6 days (1/5). Then team A rested for 4 days, team B rested for 5 days, and team C did not rest. It is known that the work efficiency of A is 1.5 times that of B and 3 times that of C. How many days did it take to complete this project?
一项工程先由甲、乙、丙三队合作6天完成了(1/5)．然后甲队休息了4天，乙队休息了5天，丙队没有休息，已知甲的工效是乙的1.5倍，是丙的3倍，那么这项工程前后共用了多少天才完成？
<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">4 * (1/60)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 90</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">5 * (1/90)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/15) + (1/18) + 1</gadget>
<output>101/90 = around 1.122222</output>

<gadget id="calculator">1 / 180</gadget>
<output>1/180 = around 0.005556</output>

<gadget id="calculator">(1/60) + (1/90) + (1/180)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(101/90) / (1/30)</gadget>
<output>101/3 = around 33.666667</output>

<result>101/3 = around 33.666667</result>