If 200 grams of 8% salt water needs to be diluted into 5% salt water, how many grams of water should be added?
有浓度为8%的盐水200克，需稀释成浓度为5%的盐水，需加水多少克．
<gadget id="calculator">8 / 100</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(2/25) / (1/20)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">200 * (8/5)</gadget>
<output>320</output>

<gadget id="calculator">320 - 200</gadget>
<output>120</output>

<result>120</result>