There is 400 grams of salt water with a concentration of 15%. If you add 100 grams of table salt, what is the concentration of the salt water at this time?
有一种浓度为15%的盐水400克，如果再放入100克食盐，这时盐水的浓度为多少．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">400 * (3/20)</gadget>
<output>60</output>

<gadget id="calculator">60 + 100</gadget>
<output>160</output>

<gadget id="calculator">400 + 100</gadget>
<output>500</output>

<gadget id="calculator">160 / 500</gadget>
<output>8/25 = around 0.32</output>

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

<gadget id="calculator">(8/25) * 1</gadget>
<output>8/25 = around 0.32</output>

<result>8/25 = around 0.32</result>