Add 5 grams of salt to 20 grams of water, the mass of salt is ((())/(())).
把5克盐加入20克水中，盐的质量是盐水的((())/(()))．
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

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

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