Dilute 32 grams of brine with a concentration of 75% to a brine with a concentration of 30%, how many grams of water should be added?
将浓度为75%是盐水32克稀释成浓度为30%的盐水，需加水多少克．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/4) / (3/10)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">32 * (5/2)</gadget>
<output>80</output>

<gadget id="calculator">80 - 32</gadget>
<output>48</output>

<result>48</result>