In a glass of salt water, the weight of salt is 1/19 of that of water. What is the salt content of this glass of salt water?
一杯盐水中，盐的重量是水的(1/19)，这杯盐水的含盐率是多少．
<gadget id="calculator">1 + 19</gadget>
<output>20</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">(1/20) * 1</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>