There are 200 grams of sugar water with a concentration (sugar content) of 10%, and it needs to be sugar water with a sugar content of 20%, how many grams of sugar should be added?
有浓度(含糖量)为10%的糖水200克，需要成为含糖率20%的糖水，应加糖多少克？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">200 * (1/5)</gadget>
<output>40</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">200 * (1/10)</gadget>
<output>20</output>

<gadget id="calculator">200 - 200 - 20</gadget>
<output>-20</output>

<gadget id="calculator">40 + (-20)</gadget>
<output>20</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>