4 cats ate 4 mice in 4 days, according to this efficiency, how many mice can 8 cats eat in 8 days.
4只猫4天吃了4只老鼠，照这样的效率，8只猫8天能吃多少只．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">4 * 2 * 2</gadget>
<output>16</output>

<result>16</result>