In order to prepare the brine for the experiment, Li Ming put 100g of salt in 400g of water. What is the salt content of the brine?
为了配制实验用盐水，李明在400g水中放入100g盐，配成的盐水含盐率是多少？
<gadget id="calculator">400 + 100</gadget>
<output>500</output>

<gadget id="calculator">100 / 500</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(1/5) * 1</gadget>
<output>1/5 = around 0.2</output>

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