There are 816 artificial bird's nests this year, four times that of last year. How many artificial bird's nests were there last year?
今年有816个人工鸟巢，是去年的4倍，去年有多少个人工鸟巢？
<gadget id="calculator">816 / 4</gadget>
<output>204</output>

<result>204</result>