Prepare a kind of salt water, the mass ratio of salt to water is 1:15, how much salt accounts for the mass of salt water.
配置一种盐水，盐和水的质量比是1﹕15，盐占盐水质量的多少．
<gadget id="calculator">1 + 15</gadget>
<output>16</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<result>1/16 = around 0.0625</result>