There is a potion, the ratio of powder to water is 1:8, the potion weighs 450 grams, how many grams does the water in the potion weigh?
有一种药水，药粉与水的比是1：8，药水重450克，药水中水重多少克．
<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">450 * (8/9)</gadget>
<output>400</output>

<result>400</result>