There is a bucket of water, and Xiaoming can drink it for 10 days alone, and if he drinks with Xiaoli, he can drink it for 6 days. If Xiaoli drinks alone, how many days can she drink?
有一桶水，小明一人可饮10天，如果和小丽同饮可饮6天．若小丽一人独饮，可饮多少天？
<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>