A cat catches mice, and it catches 12 mice in the first month, which is 1/5 less than in the second month, and 1/6 less in the second month than in the third month. How many mice were caught in three months?
一只猫抓老鼠，第一个月抓了12只，比第二个月少抓(1/5)，第二个月比第三个月少抓了(1/6)，这只猫第三个月抓了多少只老鼠？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">12 / (4/5) / (5/6)</gadget>
<output>18</output>

<result>18</result>