Niuzhuang Cattle Farm raised 400 cattle this year, which is 125% of last year. How many cattle were raised last year?
牛庄养牛场，今年养牛400头，是去年的125%，去年养牛多少头？
<gadget id="calculator">125 / 100</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">400 / (5/4)</gadget>
<output>320</output>

<result>320</result>