12-year-old child needs 50 mg of vitamin C per day. Every 25 grams of a certain fruit juice contains about 16 mg of vitamin C. How many grams of this fruit juice does a 12-year-old child need to drink to meet the vitamin C needed for a day.
一个12岁的儿童，每天需要50毫克的维生素C．某果汁中每25克含维生素C约16毫克，一个12岁的儿童需要喝这种果汁多少克才能满足一天所需的维生素C．
<gadget id="calculator">50 / 16</gadget>
<output>25/8 = around 3.125</output>

<gadget id="calculator">(25/8) * 25</gadget>
<output>625/8 = around 78.125</output>

<result>625/8 = around 78.125</result>