Put 50 grams of table salt into 400 grams of water, what is the percentage of salt in the salt water?
把50克食盐放入400克的水中，这时盐占盐水的多少
<gadget id="calculator">50 + 400</gadget>
<output>450</output>

<gadget id="calculator">50 / 450</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>