3 hens and 2 roosters came to the grass. What is the number of roosters in the total number
草地上来了3只母鸡和2只公鸡．公鸡的只数占总只数的多少
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>