If A and B work together to complete a project in 6 days, if B alone takes 10 days to complete it, how many days will it take A to complete it alone? What is the column type.
一项工程甲乙两人合做6天完成，如乙单独做需10天完成，甲单独做需几天才能做完？列式是多少．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/6) - (1/10)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>