Put 50 grams of salt in 200 grams of water, what is the percentage of salt in the salt water?
在200克水中放入50克盐，盐占盐水的多少．
<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">50 / 250</gadget>
<output>1/5 = around 0.2</output>

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