Dissolve 5 grams of sugar in 15 grams of water to form sugar water, and the sugar accounts for a fraction of the sugar water.
把5克糖溶解在15克水中化成糖水，糖占糖水的几分之几．
<gadget id="calculator">5 + 15</gadget>
<output>20</output>

<gadget id="calculator">5 / 20</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>