If 20 grams of salt is dissolved in 80 grams of water, what is the percentage of salt in the salt water? (fill in the score)
20克盐溶解在80克水中，盐占盐水的多少．(填分数)
<gadget id="calculator">20 + 80</gadget>
<output>100</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>