Dissolve 20 grams of salt in 180 grams of water, what is the percentage of salt in the salt water?
把20克盐溶入180克水中，盐占盐水的多少．
<gadget id="calculator">180 + 20</gadget>
<output>200</output>

<gadget id="calculator">20 / 200</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>