If 100 grams of sugar water with a sugar content of 10% is to be reduced to 25%, how many grams of sugar should be added?
100克含糖率为10%的糖水，如果想让它的含糖率变为25%，应该加多少克糖．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 100</gadget>
<output>25</output>

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

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">100 * (1/10) * 1</gadget>
<output>10</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<result>20</result>