It takes 15 days for Aunt Li to weave a batch of baskets alone, and 10 days for Aunt Wang to weave alone. How many days can they finish weaving together?
编织一批篮筐，李阿姨单独编织需要15天完成，王阿姨单独编织需要10天完成，两人合作多少天可以编完？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / (1/6)</gadget>
<output>6</output>

<result>6</result>