What is the salt content of 40 grams of salt in 200 grams of salt water?
在200克盐水中含盐40克，含盐率是多少．
<gadget id="calculator">40 / 200</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>