There are 600 grams of sugar water with a sugar content of 7%, and how many grams of sugar are added to make the sugar content reach 10%.
有含糖量为7%的糖水600克，再加入多少克糖其含糖量能达到10%．
<gadget id="calculator">7 / 100</gadget>
<output>7/100 = around 0.07</output>

<gadget id="calculator">1 - (7/100)</gadget>
<output>93/100 = around 0.93</output>

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

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(93/100) / (9/10)</gadget>
<output>31/30 = around 1.033333</output>

<gadget id="calculator">600 * (31/30)</gadget>
<output>620</output>

<gadget id="calculator">620 - 600</gadget>
<output>20</output>

<result>20</result>