Xiaoxiao made a cup of sugar water with 100 grams of water and 20 grams of sugar. If you add 10 grams of sugar, how many grams of water should be added to ensure that the cup of sugar water is as sweet as the original.
笑笑用100克水和20克糖制成一杯糖水．如果多放10克糖，要保证这杯糖水与原来一样甜，应再加水多少克．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>