3 cats ate 3 mice in 3 days, according to this efficiency, how many mice can 12 cats eat in 12 days.
3只猫3天吃了3只老鼠，照这样的效率，12只猫12天能吃多少只．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>