There are 80 grams of sugar water with a concentration of 15%, how many grams of sugar should be added to turn it into sugar water with a concentration of 32%.
现有浓度15%的糖水80克，要把它变成浓度为32%的糖水，需加糖多少克．
<gadget id="calculator">32 / 100</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">(8/25) * 80</gadget>
<output>128/5 = around 25.6</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">80 * (3/20)</gadget>
<output>12</output>

<gadget id="calculator">(128/5) - 12</gadget>
<output>68/5 = around 13.6</output>

<gadget id="calculator">1 - (8/25)</gadget>
<output>17/25 = around 0.68</output>

<gadget id="calculator">(68/5) / (17/25)</gadget>
<output>20</output>

<result>20</result>