In 20 grams of brine, there are 5 grams of salt, what is the ratio of salt to water
在20克盐水中，含有5克盐，盐与水的比是多少
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">5 / 15</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>