The salt content of a kind of brine is 20%, now there are 5 grams of salt, how many grams of water need to be added to prepare this kind of brine?
一种盐水的含盐率是20%，现在有5克盐，要配制这种盐水，需要加入水多少克？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 / (1/5)</gadget>
<output>25</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<result>20</result>