On Sunday, Xiao Hua made Ovaltine drink by himself. He first put 30 grams of Ovaltine in the cup, then poured in 100 grams of water, and stirred evenly with a spoon. Think about it, what percentage of the quality of this drink is the quality of Ovaltine? 4%
星期天，小华自己冲阿华田喝．他先在杯子里放30克阿华田，再冲入100克的水，用勺子搅拌均匀．想一想，阿华田的质量占了这杯饮料质量的几分之几？4%
<gadget id="calculator">30 + 100</gadget>
<output>130</output>

<gadget id="calculator">30 / 130</gadget>
<output>3/13 = around 0.230769</output>

<result>3/13 = around 0.230769</result>