Grandpa raised 20 roosters and 30 hens. The number of roosters is the number of hens ((())/(())), and the number of hens is more than that of roosters.
爷爷养了20只公鸡，30只母鸡，公鸡只数是母鸡的((())/(()))，母鸡只数比公鸡多多少．
<gadget id="calculator">10 / 20</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>