There is a potion, the ratio of powder to water is 3:8, the potion weighs 440 kg, how many kg does the water in the potion weigh?
有一种药水，药粉与水的比例是3：8，药水重440千克，药水中水重多少千克．
<gadget id="calculator">3 + 8</gadget>
<output>11</output>

<gadget id="calculator">8 / 11</gadget>
<output>8/11 = around 0.727273</output>

<gadget id="calculator">440 * (8/11)</gadget>
<output>320</output>

<result>320</result>