Put 5 grams of salt into 20 grams of water, what is the percentage of salt in the salt water?
把5克盐放进20克水中，盐占盐水的多少．
<gadget id="calculator">5 + 20</gadget>
<output>25</output>

<gadget id="calculator">5 / 25</gadget>
<output>1/5 = around 0.2</output>

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