To prepare a brine with a salt content of 20%, there are 35 grams of salt, how many grams of water need to be added to make this brine.
要配制成一种含盐率为20%的盐水，现有35克盐，需要加水多少克水才能配制成这种盐水．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">35 / (1/5)</gadget>
<output>175</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">175 * (4/5)</gadget>
<output>140</output>

<result>140</result>