If 20 grams of salt is added to 100 grams of salt water containing 10% salt, what is the percentage of salt in the obtained salt water?
在含盐10%的盐水100克中，再加入20克盐，得到的盐水含盐的百分比为多少．
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">10 + 20</gadget>
<output>30</output>

<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<gadget id="calculator">30 / 120</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>