The salt content of salt water is 5%, how many grams of salt are needed to prepare 220 grams of salt water.
盐水的含盐率是5%，要配制220克盐水，需要多少克盐．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">220 * (1/20)</gadget>
<output>11</output>

<result>11</result>