100 grams of salt water contains 20 grams of salt, and salt accounts for ((())/(())).
100克盐水里含盐20克，盐占盐水的((())/(()))．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>