Put 20 grams of salt in how many grams of water, the ratio of salt to brine is 1:5.
把20克盐放入多少克水中，盐与盐水的比为1：5．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">20 / (1/4)</gadget>
<output>80</output>

<result>80</result>