Add 40 grams of salt to 160 grams of water, how much salt accounts for the salt water.
160克水中加入40克盐，盐占盐水的多少．
<gadget id="calculator">160 + 40</gadget>
<output>200</output>

<gadget id="calculator">40 / 200</gadget>
<output>1/5 = around 0.2</output>

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