Xiaoxiao wants to prepare 4400 grams of coffee milk, the mass ratio of coffee to milk is 2:9, how many grams of coffee is needed.
笑笑要调制4400克咖啡奶，咖啡与奶的质量比是2：9，需要咖啡多少克．
<gadget id="calculator">2 + 9</gadget>
<output>11</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">4_400 * (2/11)</gadget>
<output>800</output>

<result>800</result>