In a salt water, the ratio of salt to water is 1:7, what is the salt content of this salt water?
在一种盐水中，盐与水的比是1：7，这种盐水的含盐率是多少．
<gadget id="calculator">1 + 7</gadget>
<output>8</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) * 1</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>