There is a box of milk, Ou Zebra can drink it in 12 days, if you drink it with Ou Ou, you can drink it in 8 days. Then, how many days can Ou Ou drink this box of milk alone?
有一盒牛奶，奥斑马12天可以喝完，如果和欧欧一起喝，8天喝完．那么，欧欧单独喝这盒牛奶可以喝多少天．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / (1/24)</gadget>
<output>24</output>

<result>24</result>