A medicine, the mass ratio of medicine to water is 1:4, the mass of water is 24 grams, what is the mass of medicine in grams?
一种药水，药与水的质量比是1：4，水的质量是24克，药的质量是多少克．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">24 * (1/4)</gadget>
<output>6</output>

<result>6</result>