Put 25 grams of white sugar into an empty cup, pour in 100 grams of boiled water, stir well, and drink half of the sugar water. Add 36 grams of boiled water, how many grams of white sugar should be added to make the sugar water in the cup as sweet as the original one?
将25克白糖放入空杯中，倒入100克白开水，充分搅拌后，喝去一半糖水．又加入36克白开水，若使杯中的糖水和原来的一样甜，需要加入多少克白糖．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">36 * (1/4)</gadget>
<output>9</output>

<result>9</result>