If 100 grams of salt water with a salt content of 50% is added to 100 grams of water, what is the salt content of the salt water?
在含盐率50%的100克盐水中，再加入100克水后，盐水的含盐率是多少
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">100 + 100</gadget>
<output>200</output>

<gadget id="calculator">(1/2) / 200</gadget>
<output>1/400 = around 0.0025</output>

<gadget id="calculator">100 * (1/400)</gadget>
<output>1/4 = around 0.25</output>

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