A project can be completed in 18 days by team A alone, and 15 days by team B alone. After 6 days of cooperation between teams A and B, team A will do the rest alone. How many days will it take to complete?
一项工程，甲队独做18天完成，乙队独做15天完成，甲乙两队合作6天后，剩下的任务由甲队单独做，还需几天完成？
<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

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

<gadget id="calculator">(1/18) + (1/15)</gadget>
<output>11/90 = around 0.122222</output>

<gadget id="calculator">(11/90) * 6</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">1 - (11/15)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">(4/15) / (1/18)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>