The number of hens is 60% of the number of roosters. If there are 30 hens, how many roosters are there? What is the column
母鸡只数是公鸡只数的60%，母鸡有30只，公鸡有多少只？列式为多少
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 / (3/5)</gadget>
<output>50</output>

<result>50</result>