A project can be completed in 6 days by A and B working together, but it takes 10 days for B to do it alone. What percentage of the project is completed by A on average every day?
一项工程，甲乙合作6天可以完成，乙单独做需要10天，甲平均每天完成这项工程的几分之几多少
<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>

<result>1/15 = around 0.066667</result>